Grip 12 V Solar Battery Trickle Charger

• Preserve battery power in vehicles that use 12 V batteries
• Plugs connect directly to the battery terminals
• Weatherproof design for operation in all daylight conditions
• Built-in overcharge protection

I use these to keep batteries on heavy equipment charged while I am gone in the winter where it dips to 40 below or more. It has slowed the rate at which I have to replace batteries.