Solar panel charger for 12V batteries. Includes battery discharge protection when the solar panel doesnt output current to the battery.Generates a trickle-charge current to a 12V battery, an effective way to charge and maintain 12V batteries; prevents batteries from being damaged if they completely discharge.Max power: 4.5w; working current: up to 250mA. Weight: 825g.Solar panel size: 353 x 235 x 14mm. Housed in strong ABS plastic. Cable length: 2.2m (including J-plug).Accessories included: 12V car auxiliary power plug & J-plug, battery clip connector & J-plug, 4 suction cups to easily mount onto windscreen, glass sunroof or any suitable flat smooth surface.