What do you think about power stations?
https://lemmy.fedioasis.cc/post/88971
Beware of flaming hazards if it contains lithium battery cells though. I think the main advice from fire fighters is to not keep it close to the only exit out of the room it’s in. And away from flammable materials if possible.
I may be wrong, but the majority of them are lifepo which don’t explode.