Portable battery suddenly stopped working on iPhone 6s

[nalbagli]

Hi I bought two portable ultra thin batteries a few months ago and they worked perfectly many times, problem is one of the two chargers suddenly stopped working, whenever I connect it it charges my phone like for 3 seconds and then I receive the message: "the accessory may not be certified" or something like that. The other charger that is exactly the same still works perfectly.

Any ideas on what the problem may be?

Thanks

http://www.amazon.com/Ultra-Slim-Ul..._UL160_SR160,160_&refRID=0VPMPQMXB1GG5FKE9KFQ

 

[dan.tebeau]

Not to be rude but you purchased a garbage 3rd party potable battery pack that is not MFI certified and you expected something better?

 

[nalbagli]

Not to be rude but you purchased a garbage 3rd party potable battery pack that is not MFI certified and you expected something better?

Not really I just find it strange that it started giving me that message when nothing changed and the charger was working. I usually buy certified accessories but I just couldn't find one that included the cable and really really slim, if you know about any portable charger with that characteristics it would be great.