I also wanted to have a compact "emergency generator" here. Unfortunately, this battery is far from strong or capable. I suspect inferior battery cells. My Galaxy S2 with 1600mAh battery has charged the device only to 70%. That would in itself is not so bad, after all, to get so loose on the state of emergency, but invite to approximately 10x the part no function has virtually more ... garbage. Sacked money. Annoyed about buying because you also can not change it.