Maybe you found this already, but ensure that you turn off Google TALK from auto logging in, and then sign out if you don't use the service.
Your battery needs a good 4 to 5 charges and discharges before it is broke in. You also need to ensure you do not let the battery drain to nothing during that break in period and after that maybe only once per month. It is better to charge your phone twice per day than let it drain until it shuts off so you only have to charge it once per day.
I also recommend you do not use a task killer. They are not needed, and depending on your settings, could be causing more problems than they do good.
Note the below link:
http://androidforums.com/htc-evo-4g/...oid-users.html
Quote:
Originally Posted by Extranormal
I'd be satisfied to get 3 1/2 hours from nonstop surfing. When it got to around 35% I disabled mobile internet.. and just texted moderately after that. I got around 2 hours with that.. so I would've gotten only about 6 hours with a full charge for just texting.. ridiculous.
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