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When I first got it, it was great. It lasted for a long time and was very convenient. Then I used the AC plug to charge my laptop. After that, the battery wouldn't charge beyond one dot and only lasted for about 50% charge on a phone for each charge. By this point, I was outside the warranty, and Massdrop support basically told me that they couldn't help me, which is understandable. I tried Naztech support in case there was a fix (since there was someone on Amazon with the same problem, so I know it wasn't just me) and they haven't gotten back to me for about a week.
Edit: Massdrop saw this post and got in touch with Naztech. I called their customer service line, and apparently on very early batches, using the AC port short circuited the cable. They're sending me another cable, which they say should theoretically fix the problem. Updating my review to three stars- it's a five star product if the cable fixes it.
Edit2: didn't work. Back down to one star.
How long have you had the Volt? Like any built-in power supply products (car battery, iPhone, Samsung etc) the lithium or polymer batteries will wear in time and the storage capacity will not hold as it did when new, power banks are no different. Most high-end PB's will last up to 300-400 recharge capacity. Call customer support at 661-310-1000 / extension 100 and ask for customer support to see if they can help you.
I only charged it about four times.