The cover made after unpacking an ordinary Einduck, only a slightly loose sheet tab on the "side stand" was objectionable. So charged the battery and noticed that the charging process takes significantly longer than that of standard batteries need from S3. Well, is supposed to have a higher capacity, so wait. Striking after charging it was that the spare battery is not in a position fully recharge the S3 of the ~ 30% battery. Funny, the capacity of the battery cover about 1100mAh but should be above that of the mobile phone batteries. Well, what can I say? NAfter about 3 weeks use invites a "full" battery cover only about 1min and is quite warm during charging. All in all, total scrap - Stay away!