I needed to get another power supply for my nodes for an upcoming event. I've got a yard trimmer that takes 20V Li-Ion batteries. Also, had an extra charger that was bad for those batteries (I've got a couple spare batteries), so decided to take my spare POE switch and one of the batteries to make a seperate battery box. All I did was harvest 2 contacts and the bottom half of the shell from the bad charger, checked the power pins with a DMM to double check polarity, and wire those to the power connector on the switch.