Thank you all for you replies.
The wall-wart for the PSP is just a 5V supply. The charging circuit is built into the PSP itself.
I think you’re right. I opened up a PSP battery, and there was a circuit board inside, it was the protection circuit(I had to cut a trace in order to hack the PSP) and maybe the charging circuit.
it will try and adjust the voltage to keep the current constant.
So, would a charger like this work for a solenoid?
Try loading the supply with a couple of different resistor types. 10k, 1k, 100ohms. See what the voltage is when each of those gives some kind of load to the supply.
Thanks, I will try that.
A resistance reading of a power supply’s output has absolutely no significance what so ever.
I asked about the resistance , because I thought that there was a short circuit. Is that possible ?
Anyway… Thanks for your help.