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Prolong battery life, you have any tips?

OP artisticcheese

17th August 2011, 03:48 PM   |  #1  
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I understand LiOn batteries have limited times of charge/discharge cycles, so what are exact steps I shall be taking to prolong battery life? Charge more, charge less?
17th August 2011, 08:02 PM   |  #2  
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That really depends on what you mean by battery life.
- Battery life as in the amount of time you can use your phone until it dies?
Or
- Longevity of your battery before it degrades completely

If its the later, you should start by reading this
17th August 2011, 08:53 PM   |  #3  
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Sounds like he's looking for improving cycle lifetime - e.g. long term battery retention.

1) Heat is bad.
2) Batteries like to be stored at lower states of charge. I think frequent topoffs to the 90s are OK, but I usually yank it before I hit 100. I actually have modifications in my kernel that automatically shuts off the charger earlier than stock. Still tweaking this.
3) Charge on USB - lower charge current is easier for the battery. However, if you want fast charging occasionally, I have an experimental charging algorithm in process. It charges fast when the battery is low but slows down as voltage increases, to the point of being slow than stock at the end. It's based on this - http://www.engadget.com/2011/02/20/a...s-improved-ch/

I don't know if my current algorithm is overall worse or better. It's more stressful at low voltages but less so at high ones. Based on the Apple patent above, this should overall be better, but I'm unsure of my tuning.

Edit: Oh, and don't "bump charge" - this will slowly degrade your battery's total capacity.
17th August 2011, 08:55 PM   |  #4  
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What is "bump charge"?
17th August 2011, 09:29 PM   |  #5  
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Quote:
Originally Posted by artisticcheese

What is "bump charge"?

Disconnecting the charger immediately after charge termination and reconnecting to force a little more current into the battery.

Basically abusing the charging algorithm's state machine.
17th August 2011, 09:57 PM   |  #6  
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As far as battery lifetime goes, I think you'd be fine just charging it normally (unless you are a power user). Unless you plan on keeping your phone for a very long time.
22nd August 2011, 08:40 PM   |  #7  
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Quote:
Originally Posted by Entropy512

Disconnecting the charger immediately after charge termination and reconnecting to force a little more current into the battery.

Basically abusing the charging algorithm's state machine.

So if I have a battery at say 60% left and I'm at workplace and I have a choice to charge it to 100% while I'm at work or let it discharge more and charge to 100% when I'll be home?
I mean does charging up 2 times to 100% counts as 2 counts charge/discharge?
22nd August 2011, 08:50 PM   |  #8  
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Quote:
Originally Posted by artisticcheese

So if I have a battery at say 60% left and I'm at workplace and I have a choice to charge it to 100% while I'm at work or let it discharge more and charge to 100% when I'll be home?
I mean does charging up 2 times to 100% counts as 2 counts charge/discharge?

No, when I'm talking about "bump charging", I'm talking about:
1) Charge it to full
2) Immediately after you get the "charging complete/full" indication, disconnect and immediately reconnect the charger

The above forces a little extra current into the battery, and charging like this is bad for the battery.

The two patterns you describe are fairly similar, I would probably charge it at work just to avoid getting caught with a low battery.
22nd August 2011, 08:52 PM   |  #9  
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Quote:
Originally Posted by Entropy512

The two patterns you describe are fairly similar, I would probably charge it at work just to avoid getting caught with a low battery.

But would not this pattern mean that you are cutting your battery life in half becouse you use 2 cycles out of finite number of charge/discharge cycles.
25th August 2011, 01:10 PM   |  #10  
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Quote:
Originally Posted by artisticcheese

But would not this pattern mean that you are cutting your battery life in half becouse you use 2 cycles out of finite number of charge/discharge cycles.

That's full charge/discharge cycles, so charging a partially discharged battery won't use a full cycle.

However there are other factors at play, such as avoiding high temperatures when the battery is close to full, and also potentially overcharging. "bump charging" will probably degrade a battery more than an entire discharge/recharge cycle because it pushes the battery into a state (trickle charging) where it is known for rapid degradation.

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