ferm? spare? etc....?

[spareparts]

you can make a small battery maintainer out of a couple old cell phone chargers. Go thru the pile of old chargers you have laying around(everyone has a pile), Find one thats 14V and figure out which wire is positive with a volt meter. Hook the wires up to an old cigarette lighter charger plug, when you aren't using the vehicle, plug the cig lighter plug into the lighter in the car, and put power to the charger. It won't charger up a dead battery, but it will keep one topped off.