How long does Battery last?

Firstly this is a double thread on the same topic so you might want to delete one of them 😉. It's not you it's the website.

There is a thread on here how to survive without EHU.  Hopefully I'll be able to locate it and put it on here. Mine if information. 

Found it

https://www.caravanclub.co.uk/club-together/discussions/welcome-hobby-talk/tips-for-making-caravanning-touring-cheaper/how-to-survive-a-non-240v-ehu-site/

If you only use it for water pump and lights much longer than if you use tv etc.  The thread will tell you I think it's not far down the list of topics.  Just under this one in fact!