[Mr. K]

if i recall there was a battery charger on the market that was supposed to work on any type of battery

like 10 years ago

I dont recall any explosions

I think there was just not a big market for it (expensive)

[djf]

I have a small plug-in-the-wall unit that can do AA or AAA batteries. When I say “can do”, the results varied tremendously. Certain battery brands seemed to recharge well (Ray-O-Vac, IIRC), while others didn’t do squat. And you have the problem of the charger indicating that charging is complete, only to put the battery is whatever device, have it start strong and then die almost immediately.

Right now I’m more in the “find out” phase, and not in the “depend on it” phase.

[skinkinthegrass]

if i recall there was a battery charger on the market that was
supposed to work on any type of battery...like 10 years agothat's what I recall, it used a series of continuous ....
small charges to reinvigorate the battery