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If the settings are set on continually for GPS, WiFi, Bluetooth, it can use more battery. If your screen brightness is set up to 100% it uses more battery. Set your screen brightness down to about 40%. Set screen timeouts to the lowest length of time, so the screen darkens within 30 secs to a minute of notifying you of a message or sitting idle. Turn off Wi-Fi, Bluetooth, and GPS if you're not using them. Battery saver mode usually does that. Airplane mode will save some juice but it won't allow calls. Also, if your signal strength is weak, the phone may be checking the tower continually for updates and draining the battery. Look at the signal strength icon on the notification bar at the top of the screen. If it's 1 to 2 bars, that's s fairly weak. If you have email enabled, choose for it to update less often. The more often it updates, the more often it pings the tower. I set my mail to check manually, when I want to. If the phone still drains the battery quickly after checking the settings and signal strength, there could be something wrong internally or with the battery itself. It definitely shouldn't be draining overnight. It should last days on standby. The only phone I've ever had go dead on standby in a few hours I got used and the battery was flat.
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