My battery was a bit low when I first used the SEM-1562A charger, but the case only got a little warm, never got hot.
I understand that folks with over-discharged batteries, had to charge them up with a regular hi-amp charger before connecting up for long term standby.
Don't really want to disconnect the battery, since that really wouldn't help with Self-Discharge.
Generic battery technology comparison 20% a month? Wow!
Plus, they are really fast at the local pizza shop. When I gotta go, I gotta go..