Originally Posted by doonkin
Ive a question about dual battery setup - I read you must purchase the same batteries at the same time so they have the same usage etc - is that right - I mean of course I will buy exactly the same 12v battery as I have, but 1 will be new and the other 18months old and drained down 50% and up again a few times.
Is that true -sorry for my ignorance. electric/batteries not my forte
Not my strong area, but after several years w/ rv's you pick up on the knowledge of others like on this forum. From what I've read, pairing a new battery with an existing battery will lead to early failure of new battery. If the battery you are using now is the oem that came with the TT, they are historically not a very good battery for use on a TT. Best advice is wait until next spring or whenever you plan to head out again and then pop for 2 new batteries. A little more $ on the front end, but a better value long term.