emus, I've always thought it was too bad that the industry didn't set standards for this. There is no excuse for making a charger that attaches to a battery that will explode when used with that charger. It's very easy to design a plug that will not physically attach to the wrong battery. Just like you can't plug a 110V wall plug into a 220V receptacle.
Unfortunately, maybe someone will have to get hurt before anything is done about it and that would really suck!
I can't imagine charging batt from business end could cause an explosion unless charger was defective and outputting high volts. Charger shouldn't fry when charging large capacity batt unless some serious penny pinching involved. I can charge tiny motor cycle batt or 700 CCA car batt w/ tiny cheap trickle charger. The trickle charger is happy producing <2 amps regardless of batt capacity.