I can cause a huge battery life difference in my own personal usage. For example if turn off the push email, keep my screen lower than 100% bright, turn off BT, don't have apps always updating themselves creating data calls, talk less than 30 minutes a day.....I can go at least nearly 2 days without much challenge.
But when I do all those things listed above plus send a ton of emails, SMS, along with BT stereo MP3 listening, talk an extra 2 hours, a little Wifi, etc...I could be down to only 5 hours or so.
The battery life may not be break any world records, but it is within expectations for what you do with it.
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