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The battery backup depends a lot on your usage, like screen brightness, wifi, 3g/4g data. Changing your kernel or rom will not make battery backup double. If you are just wifi user, your device can give 9+ hrs screen on time. Heavy 3G, 4G, Bluetooth users shouldn't expect huge battery backup. Regarding battery consumption when display is off, I normally lose 2% battery for about 8-9 hours of standby, but if you you keep wifi and data off in night, then you should get 0-1% drain per night.