smkettner wrote:
The battery was low on water because it had gone bad.
Probably got low again in the 6 days and internal short/spark ignited the hydrogen/oxygen mix.
Get a new battery and verify the converter charging voltage and you are good to go.
That's what I'm thinking. Or, the converter charger has gone bad and it over charging the battery cooking all the water out of it in a short period of time. You'll obviously need to start with a new battery and then makes sure your charger is working correctly and not over charging it.