Download an app called juice defender (FREE) from the market. This extends the battery charge time by cutting off APN etc. to allow 2 mins APN connection every 15 mins depending on the settings you select. I only installed this yesterday and it does seem to help.
charge mine about every other day - dont use wifi much but do have gmail syncing on . I ve set facebook to update only when I choose. I use the browser a lot over 3g and am failry happy with the battery life
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