How to stop getting a notification when my iPhone 4s is 20% low on battery?

Every time it gets down to 20 or 10%, my iPhone gets a notificatioin in the middle of the screen and it's very annoying, how can I stop that? I can still see the battery meter on the top right anyway.

First jailbreak it. Then install "LowPowerBanner" from Cydia. Its pretty much converts the pop up message to a simple banner, like a text message or etc.

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