Purchase November 20, 2012 ... this is not working or I am "stupid" !!! I am the instructions ... I'm in charge this battery before use ... I install this shell / battery my Iphone (4s) ... I do "toy" with my iphone and I expect that my battery is at 10% ... I press the left button for 3 seconds and then 4 LED light up. ... but neither it nor charging NOTHING !!!! I touch the switch (as stated in the instructions) nothing is happening ??? this function does not work !!! I tried everything .... not charge my iPhone with this batterie.Autre test ... I plug the charging cable into the Swiss Ipoower NORMALLY ... he should charge the battery in Iphone PRIORITY (as yet said in the instructions) .... NEITHER NOR, LEDs light up on the Swiss-Ipower but no charging my iPhone ... by the time I am writing this review my iPhone and from 8% to 5 charge % load with the cable connected !!! Conclusion: Either he is down ... or is it the "crap" as they say vulgarly & ... impossible for me to return it because I have not kept the pack ... Alain Burgundy