Battery theory

[foxbat121]

Nothing you said contradicts my points except for some basic understanding. I didn't say there is a preset fixed number of cycles. It is an average life span which consists of from 100% discharge all the way to bottom (which typically will be limited by the charging circuit to 10% or so other wise your battery will be dead if it really reaches 0). If you used only 20% of it (down to 80%), it does not count as a full cycle.

And when battery is full, the charge circuit will turn off. In most modern devices, the charger circuit will cut off the charge and monitor the battery level and top it off if it is below a certain level. There is no over charge possible (it is very bad for Li-ion).

The best way to prolong the life of a li-ion battery is not to let it completely drain. Top it off as much as you can.

 

[clevin]

The best way to prolong the life of a li-ion battery is not to let it completely drain. Top it off as much as you can.

Actually no, battery stay at 4.2v at 100%, it's high voltage and damage battery longevity.

Best way is partial discharge and partial charge. Charging to 100 should only be done when calibrating it, not day to day.

@T-Mobile GN3

 

[Matt Casey]

Regarding whether it is safe to leave the phone charging over night, see post #18 by Jerry Hildenbrand in this thread:
( http://forums.androidcentral.com/htc-one/288313-safe-charge-battery-overnight.html ).

Jerry seems to be confident that all modern phones will automatically stop charging when complete, so no extra heat or problem for the phone will occur by leaving it charging overnight.

It seems to me that if one avoids deep discharge and exposing the phone to extreme environmental heat, than that's about all that can be reasonably done. I wouldn't worry about charging to 100% or leaving it plugged in overnight. I don't think it's practical to always stop the charge before it reaches 100% -- that would mean you would have to time your charges every time and unplug when it reaches 80%. That seems impractical to me?

 

[foxbat121]

Actually no, battery stay at 4.2v at 100%, it's high voltage and damage battery longevity.

Best way is partial discharge and partial charge. Charging to 100 should only be done when calibrating it, not day to day.

@T-Mobile GN3

Again, you misunderstood my points. Charging circuits will charge the battery up to 100% then cut off. It will top it off when it drops to certain parentage. Its all been taken care of properly. There is nothing to worry about it when you plug it in all night. My laptops run this way all the time and I have never need a new battery in last 5 years. On the other hand, if you leave it off the charge over night, they typically will drop about 20% or so depending on the configuration and usage pattern. That will waste the unnecessary battery life.

Don't confuse with the study on battery cell itself with the actual battery technology found in laptops and phones. You can't buy Li-ion battery cells in US for that reason.

 

[Matt Casey]

..... On the other hand, if you leave it off the charge over night, they typically will drop about 20% or so depending on the configuration and usage pattern....

May be a silly question, but when you say that if you leave the phone off the charge overnight and the battery will typically drop about 20%, do you mean that you are leaving your phone turned on and unplugged overnight, or that even turned off it drops 20% when unplugged? Thanks.

 

[foxbat121]

Turned on of course with all the email syncing and other stuff.

 

[Matt Casey]

Burning the midnight pixel oil dude!

 

[foxbat121]

Have no choice because none of the apps (Gmail and stock email) Google offered support off-peak sync settings. I never turn off any of my phones.