Don't forget you will need some means of charging the battery either built in or separate and if not a lead acid battery used then a charger suitable for the type of battery fitted.

Thank you, PopTop. Most kind.

And thank you, too, Hob.

Just re-checked the spec. A battery charger is included in the kit. Phew!

yes, as others have said, fit the correct battery no venting required

I like the look of PopTop's hot water bottle there in the corner!