Battery won't hold charge

Nice looking little backup battery, but it only charged once and no longer hold charge. After being charged for many hours, push the button, only one or two out of the 4 blue led light up. Connect to iphone, and within seconds, no longer able to charge the phone. Push the button on battery again, no blue light turns on this time. Amazon sent me a replacement, and the 2nd also only worked for 2 days. Same problem shows up.

###

