For interest, here is my battery which exploded one day. It was under trickle charge from an electronic type charger, which still works. The battery cell caps were not removed for charging, but I don't know why it blew up.
Ray.
Gidday All,
I fiddle with microamps all day, my only contact with real mens'business (mega-amps), is when I go to the scrap metal yard, for a bit of dumpster-diving, and I sometimes can touch those real 3000 amp copper bus-bars, and SCR's the size of dinner plates that youse guys play with all...