Dim your display, period. [br]
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Did you know that your 3.8v battery must pump out 22v to light up your LCD backlight at max brightness? Everything else that you could possibly do to minimize draw on the battery pales in comparison to lighting the screen. [br]
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Changing the battery costs about as much as a starbucks latte if you do it yourself—you have to turn a couple of screws and pull some stickers off—-not sure what’s up with the hesitation. get busy.