Baidatong 030 Power Case for s4 mini battey case for S4 Mini (Black) Ergonomic, form fitting, fully protective ultra-resistant case and battery 100% Brand New Input:DC 5V 500mAh /Output:DC 5V 500mAh Built in short circuit and over charge protection Built in short circuit and over charge protection  Compatible with all versions of IOS 8.0 and older