12V Batteries

[DaveG28]

Hi all,

as the indoor season approaches and I won't be able to use my car battery anymore for connecting my charger to, does anyone know what amp hours I need in a 12v battery if I buy one?

Is there anything else I need to worry about with this, I ues the Orion advantage charger?

When I use my old 12v battery I am only getting one battery charged before it says there are input voltage errors!?

Dave