Generally speaking the only batteries I have encountered that have exploded have been subject to a short circuit on the terminals, or, old vented batteries that someone created a spark above whilst they were charging.
Have never encountered one that exploded from a trickle type charger.
All of the others were from basic chargers.
A fair amount of hydrogen is created while charging, and it rises.
A spark above the battery during charging is all it takes.
Well ventilated areas are needed.
They make a huge mess when they explode.
Good luck with the cleanup.
Cheers
Rob
Hi Rob,
It’s all on the shed ceiling too. I’m going to speak to the Home insurance mob & see what can be done. If they quote to have sheets replaced etc it will save me cleaning them up. The rest is interesting as it’s all over parts etc