A simple answer Raymo, yes that is getting up there,
I had a similar problem not related to yours of course just two days ago. when, the Charger in the Caravan got over heated and cooked the Battery it was to hot to touch, it was close to exploding, and bulging.
I took it to the Battery Place to see why and they immediately rushed it out side and said, " man you are a lucky bugger" the whole van could have burned to the ground
When things go wrong in the battery or charging phases with this sort of stuff be careful mate.
Leon