First 7100 screens are known to be bad in the sunlight.
Second, see what applications are running on the BB, if you keep an active browser page, google maps, etc., running, they can drain battery life. Likewise, if you are in a marginal signal area, the battery will drain faster as it constantly searches and connects to a signal.
Thirdly, you might let it cycle through about 3-4 complete battery drains to 20-30% and recharge to complete 100% a few times and see if that helps recondition your battery.
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