Cabela's offers the Sunforce Solar 5-watt 12-volt Battery Charger, model no. 50022, for $21.99. Opt for free in-store pickup to avoid the $5.95 shipping fee. That's the lowest total price we could find by $24. It uses solar power to charge your your 12-volt batteries. and includes include battery clamps, CLA adapter, and 10-feet. of wire.