Batteries are expensive, keep them fresh for years.

Battery Butler Float Charger. This is what you need to keep your tractor battery fresh and sassy through long periods of inactivity.

Keeps your battery fully charged without overcharging.
>Designed for long term tractor or vehicle storage. Hook it up to your battery. Plug it into any wall outlet, and forget it (weeks, months, even years!!!)
>Provides a constant, regulated minimum current to maintain your batteries peak capacity.
>Can be used on batteries for Cars, Trucks, Motorcycles, SUV's, Boats, Snowmobiles, ATVS, Lawn Tractors, Planes, Farm Equipment, Construction Equipment, Sump Pumps, etc.
>Individually boxed with instructions.
>One year limited warranty