Blackberry curve 9360 shuts down even when full battery

Can anyone help me pls? My bb curve 9360 phone shuts down even when almost full battery. Then when i try to reboot by taking in and out the battery, it shuts down again many times. i changed my sim card recently cos the old one spoilt. the battery drains very fast. i deleted many apps. i reduce backlighting to min. i reduce time for the screen to off. i off location services. i increased the interval for updates for my apps till very long. i noticed when it is connecting to 3G network it shuts down. and keeps shutting down upon reboot. battery runs out very fast. but can also shutdown on full battery. it also auto shuts down when i am using apps or connected to internet. Can pls help to resolve? Thanks. appreciate.
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The on-device battery meter is 'off sync' with the actual battery charge. There are a couple of ways you can try to repair this...
Leave the device to charge an hours or so, and then, still connected to the charging cable, remove the the battery from the device a few seconds and reinsert it. Watch over the next couple of days to see if the charge and the battery use is in sync.
Roughly every 30 charges, deliberately discharge your battery to 10-15%, and fully charge to 100% afterwards. This will help maintain the accuracy of the “fuel gauge” on the device (your battery meter or scale).
Don’t drain your battery every day to 10-20% of its charge. You can actually expect battery problems by draining the battery. Again, to repeat, top-off your charge during the day whenever convenient – even ten minutes in the car or at your desk will give you an extra 20-25% charge.
VIA | JSanders
http://supportforums.blackberry.com/t5/BlackBerry-Curve/Blackberry-Curve-9300-Automatic-shut-down-Pl...
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Blackberry curve 9360 shuts down even when full battery

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