BU-415: How to Charge and When to Charge?

Early batteries were reserved for commercial use only, such as telecommunications, signaling, portable lighting and war activities. Today, batteries have become a steady travel companion of the public at large to reach a friend, they allow working outside the confines of four walls, provide entertainment when time permits and enable personal transportation. Best of all, batteries help in missions when people are in need.
Folks are eager to learn more about this wonderful portable energy device and one of the most common questions asked is, “What can I do to prolong the life of my battery?” Table 1 addresses how to care for your batteries to meet their needs. Because of similarities within the different battery families, the table addresses the needs and wants of only the most common systems by keeping in mind that these desires extend to almost all batteries in use.

  • Keep a battery at a moderate temperature. As food stays fresher when refrigerated, so also does cool temperature protect the battery by reducing internal corrosion, also known as parasitic reactions on the electrolyte and electrodes.
  • Avoid deep cycling. Each cycle wears the battery down by a small amount and a partial discharge is better than a full discharge. When possible, only apply a full discharge to calibrate a smart battery and to prevent “memory” on nickel-based batteries. Li-ion is maintenance-free and the battery lasts longest when operating between 30 and 80 percent SoC.
  • Avoid abuse. Like a machine that wears down quicker under strenuous work, so also is a battery stressed by harsh discharges and rapid charges. Use cells that are optimized for the power and energy requirements as per application and increase that pack size to minimize load-related stresses.
  • Avoid ultra-fast charge. Charge Li-ion Energy Cells at less than 1C (below rated Ah); Power Cells are more rugged and can be charged and discharged at a higher rate. NiCd is the only battery that can be fast charged up to 70 percent SoC without adverse side-effects.
  • Store Li-ion at partial charge in a cool place. The worst combination is high voltage and elevated temperature. Store Li-ion at approximately 50 percent SoC.
Frequently
asked question
Lead acid
(Sealed, flooded)
Nickel-based
(NiCd and NiMH)
Lithium-ion
(Li-ion, polymer)
How should I prepare a new battery?Battery comes fully charged. Apply a topping* charge.Charge 14–16h. Priming may be needed to formatApply a topping charge before use. No priming needed
Can I damage
a battery with incorrect use?
Always store battery fully charged.Battery is robust. New pack will improve with use.Keep partially charged. Low charge can turn off protection circuit
Do I need to apply a full charge?Fully charge every few weeks or months. Continuous low charge causes sulfation.Partial charge is finePartial charge better than a full charge
Can I disrupt the charge cycle?Partial charge causes no harm when applying periodic fully saturated charges.Repeat charges can cause heat buildupPartial charge
causes no harm
Should I use up
all battery energy before charging?
No, deep discharge wears battery down. Charge more oftenApply scheduled discharges only to prevent memoryDeep discharge wears the battery down
Do I have to worry about “memory”?No, there is no memoryDischarge NiCd every 1–3 monthsNo memory
How do I calibrate a “smart” battery?Not applicableApply discharge/charge when the fuel gauge gets inaccurate. Repeat every 1–3 months
Can I charge with the device on?Avoid load if possibleParasitic load can alter full-charge detection and overcharge battery or cause mini-cycles
Do I remove the battery when full?Charger switches to float chargeRemove after a few days in chargerNot necessary; charger turns off
How do I store
my battery?
Keep cells above 2.10V; topping-charge*
every 6 months.
Store in cool place; can be stored fully dischargedStore in cool place partially charged
Does battery heat up on charge?Gets lukewarm towards end of chargeWarm but must cool down when readyMust stay cool or slightly warm
How do I charge when cold?Slow charge (0.1): 0–45°C (32–113°F)
Fast charge (0.5–1C): 5–45°C (41–113°F)
Do not charge
below freezing
Can I charge at hot temperatures?Lower threshold by 3mV/°C above 25°CBattery will not fully charge when hotDo not charge
above 50°C (122°F)
What should I know about chargers?Charger should float at 2.25–2.30V/cell when readyBattery should not get too hot and should include temp sensorBattery must stay cool and no trickle charge when ready
Table 1: Best charging methods
Strenuous demands cannot always be prevented.

* Topping charge is applied on a battery that is in service or storage to maintain full charge and to prevent sulfation on lead acid batteries.

Last Updated: 27-Oct-2021
Batteries In A Portable World
Batteries In A Portable World

The material on Battery University is based on the indispensable new 4th edition of "Batteries in a Portable World - A Handbook on Rechargeable Batteries for Non-Engineers" which is available for order through Amazon.com.

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I understand. Hide this message.
Jeff

I'd like to know if anyone has any insight into whether a rest period in between charge and discharge provides any benefit for lithium ion or NiMH? ie) after charging letting the cell sit and drop to a lower OCV before discharging, or vice-versa, after discharging letting the cell sit and bounce back to a higher OCV before charging? I can't find any data on this.

Alex C

For Macbooks, I found a ridiculous app called Aldente that can set charge limits. Link: apphousekitchen.com

Jawaid Iqbal

It's useful to deliver the knowledge to users to take care the batteries under use۔ Thanks for delivering knowledge ۔

Nithish

i bought my m1 macbook pro last year around the month of may.Since then i have been using my laptop with charger plugged in even after 100 percent.So now my laptop shows maximum battery capacity is 89 percent and life cycles is 109.Is there anything i should worry about.Is the charging method correct

John Dominick

I am a photographer. I have a set of Lithium batteries in my LED light arrays. I have not used them in a year due to illness. Is this harming the batteries? Should I charge them up, even though I don't plan on using them for a while? I have heard mixed stories to not charge up batteries until you are about to use them. Basically, to leave them stored depleted. They are stored in cases, in a cool dry place. Very confused :)
Thanks so much!

Thomas

I have a Question: I have been considering buying an AGM battery, but I have noticed that the price of 3 Varta battery are not all the same! But it is claimed that they all can deliver the same amount of energy. The battery part numbers are as follows: Varta 58395 Blue Dynamic, Varta 600400833162 'Starter Battery, and Varta G14 Silver Dynamic AGM 59590185D852.
Do you have any idea what the difference is between these three batteries from Varta?

Jim Rupert

I think he means that when the battery is full, since it's a Lithium battery, it will keep the charge for a long, long time, so no need to trickle charge. 😎

Simon

Hello!

Thank you for this outstanding guide to keeping batteries happy and healthy - hopefully it's contributing to longer battery life, and thus less waste.
I had a question about the final answer for Li-ion Polymer batteries: what does "no trickle charge when ready" mean?

//Simon

Simon

Hello!

Thank you for this outstanding guide to keeping batteries happy and healthy - hopefully it's contributing to longer battery life, and thus less waste.
I had a question about the final answer for Li-ion Polymer batteries: what does "no trickle charge when ready" mean?

//Simon

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On July 29, 2019, Alfred Briffa wrote:
I dismantled a first generation Apple ipad to reach the batteries. Is there a way how to check whether they can take charge. I couldn't check it on ipad because it was dead. I checked the four copper connections on top of the batteries unit (pos-neg, neg-pos) and acc to digital multimeter they read about 0.6v. Now I would like to know whether I can recharge them while disconnected from ipad before deciding to scrap
On July 21, 2019, Vusal wrote:
Good day. İm using 12V 240Ah 1400A acid battery. Am charging it with 100 watt solar panel. İve 20 Am solar charge controller SCC. What is the full charge voltage for this battery. İ.e. which voltage have İ to set in SCC so that it can disconnect load from pannel to battery and so that battery no overloaded? Thanks in advance.
On February 13, 2019, BillSF9c wrote:
Short answer... I am not a complete pro, but, a main issue is over charging! Your device seems to sense 100% and end the charge, and since you arenusing it, it is, discharging. One assumes that at some setpoint, 80%, 99%, it will again charge, so that when you run to class or work, you have a nearly full machine. I do not hesitate to call a manufacturer and ask. I may wait a week or month and call again if I did not feel they knew the real answer and very well. Frankly, this ought to be in your manual. You might look again. It may not be in the 2-15 page Quick-Start section. ;>)
On February 7, 2019, Maciej Jarkowiec wrote:
Dear Battery University I am so happy I found you. Maybe you will be able to help me. Short question: what is better for battery life: 1. To keep the laptop plugged (I have an Asus Zen, a version that does not give option to charge it maximum up to 80% and does not support apps that do that. What it does it charges to 100% and then it says it is "discharging")? 2. Manually keep plugging and unplugging it to run it on battery between 70-80 %? Thank you in advance for your answer. Warm regards, Maciej
On January 16, 2019, Warren Hartz wrote:
I acquired an older Panasonic BQ-4D AAA - D cell Ni Cd "6 hour" battery charger, which charges 2 batteries in each of 2 slots. I can't find a manual for it anywhere. It says Output: DC 2.9V 240mA/125mA/45mA. Why are 3 mA levels listed? Does anyone know what rate each battery is being charged? You can't charge 1 battery, either 2 or 4.
On December 1, 2018, Roger Gilbert wrote:
You may have already covered this question and I just not found it, but I would like to find this information as applied to batteries on standby duties, which may be on charge for months at a time and only discharged during an expected abnormality, such as for egress lighting during a power failure. Specifically, I'm looking for information on 1) the stresses the battery goes through from being on constant float charge, aside from electrolysis of the electrolyte, 2) viability and method of restoring a battery that is showing signs of stress from this service duty, and 3) choosing a battery and charger design to operate a battery system in this manner.
On October 22, 2018, mc wrote:
So, should a phone battery management app keep constantly topping up battery once charge limit reached, or let the battery discharge till limit, before restart charging it? Which strategy is better for phones wth LiPo batteries, when connected to a pc by usb cord)?
On June 21, 2018, BillSF9c wrote:
I could sit here for 2 days, answering 90% of these, but I nor they are paid for this. MOST of your questions were answered. ReRead and study all of this. Topping off is akin to a gas tank, as in, filling it completely. It has an asterix indicationg that this mainly applies to lead acids. Lithium batteries do not want a full discharge, nor do lead-acid. Lithiums last far longer if not quite fully charged, each time. 30-80 beats 20-80. NITE!!!
On April 5, 2018, ali32768 wrote:
For Lithium batteries in other link, you said best prolong is between 20-80 percent ! at this link you said best prolong is between 30 - 80 percent. Which is right? http://batteryuniversity.com/learn/article/do_and_dont_battery_table
On December 19, 2017, Alfred Sevitski wrote:
I am attempting revive an old battery. what is the proper ratio of epsom salt to distilled water. my battery has been properly prepaired and is ready for charging.
On November 13, 2017, Benjamin wrote:
Please is it good to use your new phone battery less than 20minutes before charging. Or what is the best way to charge your new phone battery. Or is it good to use your new phone battery before charging.
On October 2, 2017, Hello :) wrote:
Apply topping before use: charge to 100%. You don't have to charge battery for X amount of hours, but just need to get to 100% - which is the topping. I know, strange wording....
On July 28, 2017, Maureen h wrote:
when i buy a new iPhone, do I have to charge it for 4-6 hours first? and do I have to deep charge it the first three times? and can i connect my iPhone with a lightningcable to my laptop as soon as i unbox my new iPhone, to restore a backup to it? (is that bad for the battery to connect it as soon as i unbox my iPhone, or do i have to wait till its like 40%?) what is the first thing i have to do when i get my new iPhone, but the backup i want to restore to my new iPhone is on my laptop (iTunes)
On July 28, 2017, Maureen h wrote:
I just have ordered a new iPhone 6s 64GB and i have a backup of my old iPhone 5s on iTunes. i want to restore my backup to my new iPhone, but I am scared that that will damage the battery, because my new iPhone is charging when i have to restore the backup to my iPhone 6s. Is it bad for my battery to charge it as soon as I unbox my new iPhone? and if so, when is it good to charge my Phone for the first time? and do I havo to deep charge my Phone (first to 100%, then discharge to 0% then charge to 100% again, etc) for the first three times? I am sorry if my English is bad, i'm from Holland, I hope someone can help me. And thank you! If what I wrote isnt clear, please let me know that too, so I cantry to explain what I mean again.
On July 18, 2017, battery dude wrote:
I have new never used batteries but they keep losing charge why and what can I do they are car batteries.
On February 27, 2017, Rick waring wrote:
RV application. 4-6 volt batteries for the motor home house and 2-12 volt batteries fot starting the diesel engine. Coach-net is used, but new to us. Batteries were said to be new--on some I can see a sticker showing manufacture in 2016. When I finally got around to testing them all 6 had appropriate voltage readings, e.g. 6.77 for the 6 volts. When I checked the SG one cell in one of the 6 volt batteries read discharged. It had electrolyte solution to cover the plates, but was way different than its neighbor cells. The coach has a Magnum energies inverter/charger. That reads 13.38 volts for the house batteries and 12.31 for the chassis 12 volt batteries. The magnum energy reads float charge of 13.5. Is the 6 volt battery with the one discharged cell bad?
On January 20, 2017, Jun wrote:
Straight to the point and no nonsense like other websites, thank you!
On December 1, 2016, shorena wrote:
Hi dear, I have GP Power Bank Smart 2 . Model: GPPB14. I have not used them for 4 years. Batteries were kept separate. I useდ my batteries very rarely.I tried to charge them yesterday but couldn't. The lights were blinking during 9/10 hours. Please let me know. Do I have to buy new ones? Or can I charge my old ones. Many thank's in advance.
On October 31, 2016, Sabir ali raja wrote:
Nice article.thanks
On September 19, 2016, Louise wrote:
I have a sansa clip+ mp3 player that has an enclosed rechargeable battery. I charged it recently and it stopped working all together. Could the battery be at fault?
On February 18, 2016, Bill wrote:
Apply a topping before use. No priming needed” What is meant by this instruction ??? 55 11397 open fe fe@hotmail.com 2016-03-07 16:50:35 NULL Hello i just bought a mobile phone and i dont know how much time i have to charge it the first time?thanks 55 11443 open p.jagapathi babu jagapathi036@gmail.com 2016-03-13 15:42:31 NULL Tell me sir Types of batterys What is trickel charging and how to recharge the batterys 55 11448 open joni jonidahiya21@gmail.com 2016-03-16 00:24:19 NULL Sir ...I have invented a new battery of the mobile phone do not have any charge... So plz tell me how to share this technology in mobile company 55 11449 open bugembe bugembecollinmark44@gmail.com 2016-03-16 15:38:37 NULL for how long am i supposed to charge my new samsung side kick battery 55 11511 open Maju Mohan cobaltnickel.47@gmail.com 2016-03-30 03:16:45 NULL Thank you for sharing this great information 55 11547 open Dennis Buffrey dennisbuffrey@binternet.com 2016-04-07 11:29:41 NULL Sorry to be stupid but I am trying to charge my 6v battery for my lawmower. The battery has clear positive and negative signs on it but the charger has only red and black leads. Can anyone please tell me which is which? 55 11571 open Mi Breslin michael-breslin@hotmail.co.uk 2016-04-14 12:22:43 NULL Great info. But.... Do I need to apply a full charge? Yes, partial charge causes sulfation, Can I disrupt the charge cycle? Yes, partial charge causes no harm Can you clarify this? 55 11595 open BatteryBhai mayanktanwar33@gmail.com 2016-04-23 12:33:21 NULL Nice Post, charge battery when it requires. Charge battery with battery charger and don't use any other trick till not necessary. 55 11621 open Brian Griffin brian@yourcoach.net.au 2016-04-27 22:15:35 NULL Hi. I Purchased a set of Trojan T1275 batteries for my golf cart and was expecting to get 4 to 5 years out of them but they started showing signs of failing after 2 and a half and by their 3 year anniversary were not able to perform for more than 9 holes. The suppliers took them away and tried whatever recovery process they could but finally returned them saying they were slightly improved but the recovery process didn't have much effect.They of course blamed the charging process, postulating that they weren't receiving a full charge and that had hastened the sulfation process (which I understand would be the case.) So I am about to fit a brand new set of T1275. I also replaced the on board computer on the cart itself. How can I check that the batteries are receiving a full charge? It's far too expensive to be replacing these batteries every couple of years. I live on a golf course and play 2 - 4 times a week so the batteries do get a bit of a workout. I do try to follow a regular maintenance routine. Any information and/or suggestions are most welcome. 55 11831 open John Carass j.carass@ntlworld.com 2016-06-02 08:57:35 2016-06-02 23:08:10 My phone is currently in a leatherette case about 2mm thick, is this bad? 55 11918 open Satheesh satvish2001@yahoo.com 2016-06-16 13:50:10 2016-06-16 18:11:29 Can I charge lax20 battery with external car battery 55 11977 open John o'Connell johntoconnell@yahoo.com 2016-07-03 10:30:43 2016-07-04 19:01:22 What should be the final voltage reading of a fully charged 36v 3000mAHr Li-ion battery? 55 12038 closed Jason Harcourt savesmasher40@gmail.com 2016-07-15 03:26:24 2016-07-19 20:43:52 Hey check out my favorite rechargeable batteries here: http://jasonharcourt.com/index.php/products/ I have had them for years!! 55 12116 open Charles lindroth Clindroth32@yahoo.com 2016-07-30 15:22:13 2016-08-02 20:54:14 i have a saints mart ds201 scope. It has a charging port that is square and is 3.7v. 550mah. I have the charger that is supposed to go with it but it is a 110v /9vdc 650 ma with a round male port. Where did I go wrong? 55 12326 open Prabin praabin@yahoo.com 2016-09-10 07:10:00 2016-09-12 16:31:25 Li-ion is maintenance-free and the battery lasts longest when operating between 30 and 80 percent SoC." does it mean, it will compensate one cycle wasted(80-30)? battery has definite cycles or do they vary with usage habit?
On January 24, 2016, Nick wrote:
Apply a topping before use. No priming needed What do you mean ?
On January 23, 2016, priyanka wrote:
Sir I want to know about mobile battery and how should i prepare it.I want to do a project on it.so please suggest me sir
On December 23, 2015, jb wrote:
Once again this article repeats the warning against charging while the device is on. This probably applies only to older/cheaper devices where the connection between device and battery is dumb, and the external charger charges the battery directly regardless if the device is on or off. On modern high end devices such as phones and laptops there is dedicated battery management circuits inside the device and the charging process is not confused by the device being on during charging. Some models don't even charge unless part of the main device is powered on to run battery management software that keeps track of the charging process and does the needed switching between phase 1, 2, 3 and stop states.
On December 10, 2015, naveed wrote:
tel me plz charging cut off volte narada jel batry (mpg) series. 13.75v or 14v or 14.20v.plzzzzzzzzzz AGM cut off voltag????? AGM meaning.?
On December 3, 2015, awoke computer and related goods shop wrote:
How can i charge my battry using dc voltage ?
On November 28, 2015, Dom wrote:
My Xperia switched on the first time I charged it a few days ago. Possibly I pressed the power without realising (but I thought not). I let it charge switched on like that. Will that have significantly shortened the battery life/capacity?
On October 22, 2015, Matichu San Miguel wrote:
Apply a topping before use. No priming needed What do you mean by this?
On September 29, 2015, sr wrote:
I only kept my phone for 100% charging only about 1 hour on the first use. And now the 2900mah li-ion battery is discharging very fastly . How can I solve it?
On September 8, 2015, dhivya wrote:
i got my new battery and my mobile is old mobile i charged my battery for 5 mins and still my phone does'nt on i need to know whether it is a mistake of my phone or battery could you help me
On August 19, 2015, Tommo wrote:
Majestic!!!
On July 31, 2015, Franky wrote:
Really helpful! Thank you!
On July 4, 2015, Christiaan Ghijselinck wrote:
Specific questions about LiFePO4 battery cells : The nominal voltage is 3.20.V. Does this means that its SoC is 100 % ? What is the cell voltage ( without load ) at a SoC of 80 %. What is the SoC in % when the cell voltage has dropped to 2.95 Volt without load The nominal cell voltage is 3.20V , charging to 3.65V allowed. May damages occur when a charger keeps charging a cell at 3.30 Volt for a longer period of time , even if the cell is fully charged ( charge current has dropped to its minimum )
On June 27, 2015, Christian wrote:
Pls what should I use to charge my new phone battery so that it will last for 24hs
On May 15, 2015, Michael wrote:
I have a 6v 4.5ah 20hr Lead Acid Sealed Battery used in a toy bicycle. It comes with a charger 6v 500mA. a) How long should i charge the battery? - I read it should automatically switch to float charge so does this mean i can charge it as long as i want - even days, months? b) How will i know when it is actually fully charged? - Can i use a multimeter to check? I dont have one but I can go out and buy a multimeter - but i dont know how to use it. Pls give me step by step instructions.
On April 15, 2015, issy_i wrote:
Hi guys i noticed when the battery is charged fully it drops really fast from 100% to 98% within a minute.. (doing nothing exept turning on screen) Then it keeps dropping "fast" to about 75% But then it stablize.. Very weird. Im satisfied with the battery life becouse most of the time i get 4 hrs Screen on time...... Just noticed the fast discharge from 100% +- to 75% Is this normal? Using the Sony Xperia z3 compact (li-ion batt) Also when fully charged 100% it shows 4,25mV... I thought everything above 4,2mV is bad? (you can chech this by dialing *#*#4636#*#*
On April 7, 2015, Edward wrote:
Daniel, You can use the cylindrical 18650 Li-thium battery pack to replace the all battery packs
On February 1, 2015, Daniel Rawinsky wrote:
I would like to know more about locomotive batteries. We have a 1943 Alco RS1 which runs on 8ea 8v batteries. We have been trying to keep the batteries charged but since the alternator for keeping the batteries charged (as compared to the alternator to power the traction motors) is not working. We have found some dead cells and these batteries are expensive and very heavy. What kind of battery would be suitable to replace the dead batteries? Thank you Daniel Rawinsky
On January 16, 2015, Vidya wrote:
can i use the sony rechargeable batteries in kodak charger?
On November 18, 2014, Filippo wrote:
I have a samsung galaxy s3 or anyway smartphones in general could you tell me which range of charge is better for the life of a lithium ion battery? something between 20 and 85% ? I guess
On October 25, 2014, Angelo wrote:
Volker thanks for your response. Your right. I researched firther and it all depends on the charger.
On October 23, 2014, Aruna wrote:
does the amount of input voltage equals to each of the output voltage
On August 13, 2014, V.H.SHAJI wrote:
SIR, I have one touchmate MID 790 tablet which is new and one year old,not working so far, Now I charged with power,the charge not existing at all.What is the reason,and remedy also.Please advice me to my email.
On August 6, 2014, sumit wrote:
I just bought a moto G How do I first charge it to increase battery life. pleeaase help
On June 27, 2014, Narcais wrote:
I have a problem with my phone: In normal charging the phone battery is not charging more than 51%. I tried several types of chargers and is the same problem (battery charger is not the problem). On an external charger battery charging normal 100%.... Which is the problem?
On June 24, 2014, Volker wrote:
@Angelo: this seems to depend on the charger. I know that e.g. for all Jun-si iChargers (chargers for rc model) first method is the correct method (First plug the charger to powersupply , then plug battery to charger) and 2nd method can damage the charger. For other chargers may be you can choose either method.
On June 24, 2014, volker wrote:
there's following setup given: cheep model helicopter with a single LiPo cell (3,7V, 1000mAh) and a simple "charger" Vout= 4V, 500mAh. charger seems not to have any charging-electronic. Possible to coverload the battery with this "charger"?
On June 19, 2014, Azlan Aziz wrote:
Informative article & very helpful.. Thank you.
On June 18, 2014, Angelo wrote:
Half the battery pros say plug in the charger first then plug the charger into your battery. Other so called battery pros say plug into your battery first then plug into the charger then plug the charger in. Which is it?
On March 21, 2014, Nigel Ndlovu wrote:
My battery has not been charged for two weeks and it seems to have a problem cause i put the charger on and its still 0% full . What can I do
On December 23, 2013, muhammad Bilal wrote:
what are the principles work behind the cahrging of a battery?? can anybody help me
On December 12, 2013, BERGE JERMAKIAN KC2SBO wrote:
All batteries when not in use self discharge. The type determines the rate of discharge. In the case of lead-acid batteries not being used for any period of time should be put on a charge maintainer. Keep in mind that weak or discharged lead acid batteries can freeze if left in prolonged freezing temperatures, which can render them useless. Ni Cads discharge fairly rapidly. Keeping them in a cold location will slow down the self discharging. Lithium batteries have a very long shelf life at normal room temperature.
On November 23, 2013, Megha wrote:
not fare enough...
On September 9, 2013, Solomon wrote:
a useful message
On January 12, 2013, jayasuriya nandhagopal wrote:
its a owesome site which i have seen. i like tis one .i got useful informations in tis site
On January 9, 2013, SOUISSI wrote:
Des cours tres instructis un grand merci a tous .l'echange du savoir humain merite notre reconnaissance car un jour l'humanite en y puisera son salut.
On November 28, 2012, Jaka wrote:
You are the best! It is really helpful instruction.
On November 24, 2012, Davey Dee wrote:
Strange that the author here does not reply, for those needing help.
On November 19, 2012, Mário wrote:
This topic it has been very helpful to me, I've 4 12v 100 amp batteries, in a 12 volts battery bank. I want to charge them as quickly as is possible without damaging them from 220v a/c source, Whats the technical specifications that i should look for in a charger. A model would be a great help but as I live in Africa it can be difficult to find.
On October 12, 2012, Jose wrote:
I just bought a tablet and i just like to know if it is okay to leave it plugged in while it is docked after it has charged to full while using it...
On September 24, 2012, omar wrote:
when the battery is completly charged is there any damage on it when i keep the charge on and is it disconnect when it fully charged ??
On June 20, 2012, James Japp wrote:
Discharge NiCd every 1-3 months Does this mean that I should be discharging even those batteries that I don't use very often. In some torches it would take me half a year, if not more, to fully discharge battery by normal use. Should I intentionally drain those batteries every 3 months?
On March 26, 2012, Ali wrote:
tnx for your gr8 article I had a question about li-on batteries Is it right that some people say charge your battery only when it is on 40% or 60% of charge and cut off the battery from charger when it reached the 80%? plz answer me!
On March 16, 2012, Tina wrote:
what does topping mean?
On February 25, 2012, Craig wrote:
Lithium Ion batteries, can I check voltage to determine if they are fully charged? They are for portable radios at 7.4 volts. Thanks in advance for your help. Warm regards, Craig
On January 23, 2012, Mercy Ejindu wrote:
my phone battery is charging on it own with the power what should i do
On January 22, 2012, Junedul wrote:
my batteries alithium ion i bought it new as a replacement and have been charging it for 3 day i turned it on and it was at 75% and said critical i turned the adapter off and the laptop lasted a minute, have i damaged the new battery and why is it stuck on 75% thanx
On January 10, 2012, Himani wrote:
Informative article !
On December 1, 2011, mahesh wrote:
sir i have a huiandai tubler bettary for my invertor it is 60% damage but company can not change it. in what type i can dead fully damage my bettary
On November 22, 2011, zachary wrote:
how long do you charge a 12v Lead acid (Sealed, flooded) battery?
On October 14, 2011, jacob wrote:
What is the recommended charging time for the first charge of a lithium ion battery for a new cell phone? I should charge it before I turn my phone on, correct? Its a 1500halloween mah, 3.7v. Any help would be appreciated. Good articles here.
On October 5, 2011, Ramakanth Viswanatha wrote:
can i use a dynamo ( for example a dynamo in a cycle to lighten the head light ) in a byke rear wheel . So, that while running the byke the dynamo works and through wiring the dynamo is connected to a rechargeable battery and so the battery is charged and there is no issue of charging drop rate....This was my assumption .
On August 27, 2011, fastman wrote:
Thanks ...this article is very useful ..I am going to buy a new laptop tomorrow with lithium battery and I will not fully cahrge it the first time as i thought
On July 18, 2011, rich chapman wrote:
I've got one- Why do instructions for many battery cell chargers say to first put the battery in the bay and then to plug the unit in? Does it not charge correctly if you put a battery in the bay when its already plugged in?
On July 5, 2011, Jerome Girard wrote:
Simple, precise, thanks a lot!
On June 8, 2011, Lazaros wrote:
My original charger is at 700 mAh. Could I use another at 1500 mAh or it would deteriorate my phone battery?
On April 18, 2011, Sameer Wagh wrote:
Good articles , but I have one question..... If we add batterties in Parallel to increase capacity , how much capacity chargers are required. i.e. do we need to add the Ahr. capacity of all batteries to determine the capacity of charger? If we add batteries in series to increase voltage requirements , do we need to increase the capacity of charger. Rgds
On March 26, 2011, Francisco Bolivar wrote:
I have an elerctric bike with a 600w - 36v motor. It uses a li-Ion battery. Usually each time I use the bike its charge drops about 20% of the total battery charge. WHAT IS BETTER DO DO: 1 - CHARGE THE BATTERY EACH TIME I USE THE BYKE (battery with 80% of charge) 2 - CHARGE THE BATTERY ONLY WHEN IT HAS 60% OR 40% OF CHARGE
On February 9, 2011, john wrote:
Is there a problem if 5 batteries in different stages of remaining capacity are charged together with one charger?
On January 19, 2011, Glyn wrote:
Very useful and informative - keep up the good work
On January 15, 2011, arpit wrote:
gr8
On January 15, 2011, arpit wrote:
gr8 article
On January 7, 2011, antonyananth wrote:
tnx sir