The Samsung Mega 5.8 (i9152) is a great new device that combines both a smartphone and tablet into one. What’s not so great is all that power it consumes on a daily basis. Make sure you’re never stuck with a powerless phone again with the Galaxy Mega 5.8 i9152 External Battery Case. With a powerful 3500mAh built-in battery, this battery case which also provides protection from bumps and drops, effectively extends the battery life of your smartphone. No cables or plugs needed. Simply press the power button on when your Galaxy Mega needs an extra boost.