They determined the cause of the fire that burned a neighbor's house down, a total loss.

[ProfessorGAC]

2. I Use The Same Brand

I fully unplug the charger i use for the mower all winter & the one for the snowblower 8 or 9 months a year.
The smaller batteries for the blower & hedge trimmer are only on, on a power strip when I actively need to charge a battery.
I might turn them on for a half-hour once a month, just to keep the batteries at around 50%.
But, I try not to just let them sit on the charger.
However, my charger does not turn itself back on if the battery discharges over time. If I want the battery to top off, I have to physically lift it and put it back in place.
Maybe there are different generations of chargers.