hi there zl4plm, you can make small improvements in the battery performance through some of the user settings on the device. For example, if you use mobile email on a Symbian (Nokia E71, E75) or Windows Mobile (Samsung, Palm etc) OS device then go into the device client settings (MfE for Symbian or Active Sync for WinMob) and change the sync settings to increase the intervals that your device pings the email server. Also you can reduce the screen brightness and screen timeout period; both achievable on BlackBerry for example.
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