Or see any downsides?
We all have heard about home fires started from power tool battery charging fires.
How about gutting/disabling an old micro wave, SS would be ideal, slap a working smoke detector on top, drill a hole for a power cable in a good spot, locate in garage/non living space(?) and place your battery charger inside, plug into a GFI, and use it to charge your power tool batteries?

Reality check, that half the population is smarter then 50% of the people and it's a constantly contested fact.