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no apps runnig in background, no data connection and sync running still display used the full battery.check for apps running in background, turn off data connection when not needed, make sure your not syncing emails very 30 mins etc!
is wifi, bluetooth, 3G on? is screen set to max brightness?
i turn off all unused connections till needed
set screen to minimum brightness
installed app killer to turn off all apps every 30 mins
mine lasts for 4 days on average
marcel
Have you switched on power saving mode which is found under settings and then display.