This PCMag Mobile[1] article from early 2011 give some pointers on improving Battery Life in your android phone. They are all good suggestions, but I find my Samsung Charge eats battery for the display (which is gorgeous, BTW) and the 4G radio. On 3G the battery does pretty good. So for me, setting the display brightness as low as possible/visible, and try to minimize what radios are turned on (WIFI, BlueTooth, GPS, 3G/4G) seems to do the trick.

I forgot my cell at home one day and had the WIFI on, and 3G was dormant (no 4G reception at home yet), and only went through about 14% of the battery between 7am & 6pm. Today I was up at 4:30, read a book, caught up on email & TweetDeck, drove into work (and 4G coverage) and had burned through at least 30% of the battery by 8am. So your mileage WILL vary.

Just looked up pricing on an 2600mAh battery for the Charge. $89 + $10 for the new back cover. Probably not going to happen…

Links in this post:
[1] http://mobile.pcmag.com/device2/article.php?CALL_URL=http://www.pcmag.com/article2/0,2817,2367542,00.asp

Advertisement