Solved How long to charge a Li-ion battery?

Hewlett-packard Psc 2175 all-in-one prin...
May 15, 2013 at 15:35:20
Specs: Windows XP SP3, AMD Athlon 2GHz/512 MB RAM
I apologize in advance if this isn't the right forum to post this.

I just got a new phone after my old one pooped out on me. It's a TracFone LG 840G with a 3.7 V Li-ion battery (1000 mAh). Part of the reason my old phone broke down was because the battery got completely discharged. I don't want that to happen to this phone.

I've heard some say that you should always let the battery discharge all the way and then recharge all the way. I've also heard others say that you should let the battery discharge/recharge all the way for the first few charging cycles, but then you should only discharge to 40% and charge to 80%. Supposedly, this "40-80" rule should prolong the life of the battery.

Anyone have any suggestions?

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May 15, 2013 at 15:56:21
✔ Best Answer
Lithium Ion battery chargers are very sophisticated, as is the circuitry to keep them from discharging to far. Letting your battery discharge all the way is not what broke your old phone. You also don't need to let it discharge all the way every time, that is oldschool thinking from the days of NiCad and nickel metal hydride rechargeable batteries when discharging them partially would cause a memory effect. Most manufactures suggest you do run the battery down all the way occasionally to calibrate the battery to the charger.

Yes, technically the 40/80 percent will prolong your battery life (this is how the Tesla car company gets 8 years out of their Li-ion batteries)but in reality your not going to get much of a runtime if you follow those rules. If you let the phone handle the charge and discharge amount, you should get a good couple of years out of your battery before you notice a lesser performance.

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May 15, 2013 at 16:43:29
So, would it be best if I would maybe charge my phone for 4-5 hours when the battery gets down to 1 bar?

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May 15, 2013 at 19:46:15
The battery icon isn't displayed in bars so perhaps you are confusing it with the signal strength bar? There is a way to display the charge in percent, so post back if you want to know how to display it that way.

Personally, I would just let it charge fully. Plug it in at night, or whenever needed, and let it charge all the way up. If you want to do the charge to 80% then your going to have to monitor it and check it every 10 minutes or so.

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May 16, 2013 at 22:22:32
Thank you for your help! I'll try to remember not to let my phone battery run all the way out like that all the time.

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May 17, 2013 at 09:02:43
You're welcome.

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