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Just some knowledge on lithium ion batteries. It's why HTC did not enable the Qualcomm quick charge on the One.

N.B. Lithium polymer batteries work very similar, so this also applies to those


1. Charging is what reduces the life of a lithium ion battery. Batteries are usually rated between 700-1000 charge cycles while keeping 90% of their capacity.

2. Charging 0-100% counts as one cycle. Charging 80-100% 5 times counts as one cycle.

3. Leaving your phone on the charger after it is charged has the potential to reduce battery life, although this is less of a problem with newer devices as they often disconnect the charging circuit until the battery drops below ~95%. Generally only an issue if you leave it on the charger for 24+ hours.

4. Lithium ion batteries do not require any conditioning.

5. Most lithium ion devices arrive with ~40-50% battery life remaining, because this is the optimal charge level to store a lithium battery for long periods (such as sitting on a store shelf for months).

6. Slower charging maintains the battery's overall lifetime capacity better than fast charging. This is likely why the HTC One does not have Qualcomm's Quick Charge enabled. It's debateable whether you'd notice the effects over the typical lifetime of a smartphone, however (2 years).

7. Not exactly related to lithium but just in general: smartphones (and tablets, etc) have charging circuits that only draw a certain amount of amps regardless of the number of amps the charger provides. Using a 3.1 amp (tablet-level) charger is not going to significantly increase the speed at which your phone charges. Most phones only use between 0.8 - 1.2 amps. Anything over that is overkill.

8. Storing a lithium ion battery at 0% is really bad for its lifetime capacity. Running it to 0% generally isn't recommended all the time, but a few instances won't hurt it.

9. Recharging from 0-100 doesn't make your battery run longer. It can, however, reset Android's battery level stats so that it can more accurately state the battery level.

10. Charging from ~95% to 100% takes a long time because it must do a trickle charge. Maxing out the battery like this can reduce overall lifetime capacity, but generally not enough to matter. You'll see this impact more often in larger applications of lithium batteries (like cars).
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I'm used to have my phone charging via USB all the time if possible.  I wonder if there's a way to know if it's actually disconnected from the charging circuit as you mentioned in #2.  Maybe there's an app or setting for that.
So what's the optimal charging strategy to maximize the life of your battery?
+Shen Ye I have question. I read somewhere on what as a pretty legit and scientific article that batteries do not like to be charging and discharging simultaneously. So my question is does it help reduce charge cycles by charging with your phone off for short burst of charges? Does it make a difference? Does it lessen the life of my battery by charging it while using it but in smaller burst? 
+Xen Rider Plug it in when you need to and don't worry about it, you'll replace the device before your charging "strategy" comes into play.
+adryan maldonado I believe it's more because the phone is drawing from the battery, so more power is drawn in an attempt to charge the battery AND power the phone. 
I suppose it could be looked at as many micro charge cycles on the structures in the anode. Since power draw on a portable device is all over the charts since they aggressively clock down.
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