Replacement leisure batteries

[slowgiles]

Thanks everyone for the input. Started off thinking this could go badly wrong, but now confident I will end up with an improved system for longer periods off grid. My current batteries do give a Green light once I have been on main for a night and a shine a torch at the observation window, but drop to 12.0v in less than 4 hours if I come off mains. That is based on 1 lights, 1 TV, 1 USB charging port being used, electric to fridge lights only (fridge running on gas). This is the reason I asked for advice, as 4 hours is pretty pish and don't want to lug a generator around.

Once again, so many to thank for giving me the advice I needed, so thank you all.