good spare battery and charger?

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http://forums.androidcentral.com – I have this s2 epic 4g touch and i LOVE it. The problem is i am a heavy use r and the battery life isn't so great even with the low brightness, the app killer and the battery saver i still end up charging it twice a day. So i would like to get an external charger and a spare battery for it i don't want to buy a cheap Ebaybattery that is going to break. Please link me to a good spare and charger. (HowTos)