For the early Sony readers with the round barrel charging connector I use a dual connector PSP cable that has a standard USB A connector on one end and both a barrel connector and a USB Mini connector on the other end. Allows use of any USB charger to charge those antiques using the barrel connector.
https://www.amazon.com/Genuine-Data-...2314472&sr=8-3
I have never gotten one of the old Sony's to charge decently using the USB mini connector.