Ok, normally I would read something like this and laugh... but I was sitting here at work last night, stuck on a conference call so I decided to try this out... and I actually noticed a difference in my battery, especially the first 10% normally lost pretty quickly. Do it or don't but I'm glad I did.
1. Turn the
EVO on and
charge it until the
LED indicator turns
green.
2.
Unplug it and
turn it off.
3. P
lug it back in and
charge until the
LED indicator turns
green.
4.
Unplug it and
turn it on.
5. Once powered on completely, turn it
off again.
6.
Plug it back in and
charge until the
LED turns
green.
7.
Repeat steps 1-6 until the
LED turns
green within
30 seconds after plugging it back in in step 6.
8. Unplug it, turn it on, and use it normally.
Took me like 45 minutes to get it where the LED turned green within 30 seconds (actually I went further and did it until it turned green within 15 seconds in step 6.) Had to repeat steps 1-6 a total of 5 or 6 times but I read that some people had to do it a lot more or even less. Depends on how "calibrated" your battery currently is.
I believe the reason this works is that the battery has multiple cells and by doing this procedure you are equalizing the cells so that they are all truly at 100% If you will notice during to process your LED can be green with the phone on then you turn it off and it take 5 or more minutes for it to turn green again. This I think is because some of the cells may have hit 100% so the phone says to stop charging, then you turn it off and the remaining cells get charged up to 100%.
Source for this info:
here