I have a universal battery charger, made for NiCd/NiMH 3.6v; 7.2v & 9v batteries plus AA & AAA cells with a 500 mAh USB port for charging other things. It’s 12v power supply fried itself so I replaced it with a different unit. Last night the smoke got out of the replacement unit & it smells horrid. I’m scare to use it.
But both have the same 12v input specifications, so the power brick for the replacement device works fine with the original one.