I have had it since Dec 19, it was a Christmas present for my wife
It get charged on about a weekly basis, so maybe 30 discharge cycles.
I have not notice any performance degradation yet. It can recharge a Samsung J4 or Tab E in a few hours
Alternatively, I connect it to a charging point, and at the same time connect my phone in the output port. Then both the power bank and the phone charge at the same time.
The charging point is normally a mains socket with 2 USB charging points. I have these in the bedroom, and they are great, never have to hunt for a 2 pin charger, which does not make a good connection.