I bought it in February and it worked well enough for three months. I checked the capacity when it arrived with a power meter after recharging and discharging fully, and it lined up with the rated capacity. The battery percentage shown is inaccurate and would either drop rapidly or stay on a particular number, but would eventually reach 1% and shut off. To fully recharge it, you have to keep charging after 100% until the screen turns off.My use case had it on a table that I needed power, but didn't want to run a power cord to, so it had an easy life and only moved for charging. I would run it down every 1-2 weeks recharging laptops and small electronics and immediately recharge it. Recently, it's been charging slower over 8 hours instead of 4 like when it was new. After the last charge, the screen does not turn off and the Type-C1 port does not output any power. Luckily, the C2 port is still working and I have drained it. I will not be recharging again in case the failure causes a fire.The included manual card states that there is a 12 month warranty, but there is no contact information anywhere. They don't even appear to have a website and only sell on third party sites. I had expected it to last a little longer.Update: I was contacted by Krisdonia Services through Amazon message and they sent a replacement unit. If you need warranty service, you can message them on their Amazon sellers page. The new unit has the same inaccurate battery percentage as the last one, which is fine for my use case.