I can't find a USB brick I really like. The biggest problem is that all units I tried (~7) have the same problem. Depending on how own-charge or to-be-charged power goes away they stop charging the USB device at some point. They have a "power button" that you have to press to get them back to power their connected USB device. (disconnecting and reconnecting works, too, but that doesn't do the job for me, I want unattended operation)
Another concern is that I want to use battery cells of my own choice.
So I'm looking for just the charging electronics. And it should be like an always-online UPS.
Any ideas?
Another concern is that I want to use battery cells of my own choice.
So I'm looking for just the charging electronics. And it should be like an always-online UPS.
Any ideas?