I've had one of these for about 4 months now, using it to charge my phone when I forget and am on the go or at work and cant be anchored to a wall.  It works decently for my needs but note that one full charge cycle would only fully charge a near dead phone once (Standard Galaxy A21), with only enough left over for maybe 1/3 to 1/4 another phone charge, or 'almost' a full charge of my earbuds. Recharging the bank didn't take long (1.5-2.5 hours for 0-100%). The rate of recharge for devices drawing from the bank itself was about the same as when connected to a laptop battery via usb. Slower than a wall socket, but fast enough to gain power even while being used.    The bank's overall power storage capacity was nothing great by any means, but acceptable for the price point and the purpose of getting power and being able to keep the phone in your pocket in a pinch.  I was satisfied enough with it to buy one more to leave at work permanently. This is the one that was a complete lemon. One of the two usb ports snapped off internally the second time I plugged something into it, which I ignored because I could still use the USB-c port or the second USB (all three ports work for drawing in or out power).  About 3 days and one full charge cycle later the battery began to fail completely.  I charged it fully, would plug it into my phone or earbuds for a charge, all appeared normal, but 5 minutes later the LED lights indicating a charge was in process would just turn off.  It would just shut itself off/stop working completely. Half an hour later if you reconnected the plugs it would again begin to charge with the lights claiming the battery was nearly full, but do the same thing again.   Anyway its pretty much a paperweight now. It refuses to charge anything for more than 5-7 minutes without being left alone in a time out corner.4/5 for the first one, being only 20'ish bucks and does work as intended, but 0/5 for the second as it didnt last 3 full charge cycles or 1 week.