I replaced my 12-year-old house battery today. It was still able to get through a night of minimal needs (lighting, fridge) with my old one but the charge would get down low by morning. Replacement battery is same as original:
Lifeline GPL-4DL.
I used a jack to lower the heavy battery. It was quite rusty down there, and removing the four bolts holding the battery tray in place took some effort.
Before installing the new battery, I ratchet-strapped it to the battery tray. (Sportsmobile didn't have it tied down in any way before!) I also made sure any loose power cables up there against the battery were zip-tied to the frame so they wouldn't rub.
Hopefully I'll avoid another engine fire Getting the heavy new battery back up in place was a delicate balancing act! I also had to jack up the side of the van one inch to get my battery-on-jack to clear and roll under the van.
Finally, I placed the plastic battery cover back over the battery. I cut holes in it for the power cables, and also ratchet-strapped this in place so it wouldn't flop around like before.
-- Geoff