Second battery
Our camper has only room for one group 24 battery. A few years ago I added wiring and a multipoint switch for an additional battery to go ahead of the rear wheel well but have not used it until now. ...
Forum Discussion
jimh425 wrote:
Everyone has always told me that the batteries should be the same age. .
They also tell you to not put 2 different oils into your engine and not to mix vodka with beer.
But to give more explanation to what I wrote above.
Let's say you have one battery that fully charged has 12.5V and you hook up parallel with other one that has 12.4v
If you leave them like that, the lower battery will drain the power from the higher battery.
But in RV, you hook them up and almost immediately start using, so after some time they both will discharge to 12.3v for example.
At this point the difference doesn't matter.
