Got a heads-up for all you stickers out there. I bought a 52,000 mah power bank today that came with a USB. Not sure what happened next, but, the power banks lights suddenly went out while trying to charge it. Thinking it might be the fault of the supplied USB cord that came with it , I plugged it into my istick.......now my istick won't charge at all, no matter what USB cord I use!! The wall wart is the same one I've been using all along. My guess is that the USB is an older style or something and not compatible with the istick. When I try to charge the istick, It shows a full battery icon (not blinking) then when I pull out the USB the battery icon shows half charge, even after several hours. I fried something in the charging system by using an incompatible USB. I used this istck for 9 weeks with no issues 'till now...May it RIP.. Be careful.