I have these spare battery (White) ordered in April and was even more so euphoric. The handling was easy to recharge and the 'discharge' in the iPhone without problems and difficulties. Last week, the difficulties have now but now it started to my regret and to my disappointment. The mini-USB plug contact for charging the auxiliary battery had massive difficulties in the manufacture of contact for recharging, Sunday work, the 'discharge' in the iPhone no longer, it came on the iPhone the message that charging via the connected device is not permitted to be ( ????) Complete downloading or rauffahren the iPhone was not successful, the Zustzakku is so useless and the 28, - Euros Perdü ... I can Because of this experience so advise only one purchase. Too bad, but just a 1/2 year functionality is not enough.