Solar Power Keeps Your Vehicle's Battery Topped Up. Modern cars draw a lot of power from their starter battery, powering systems such as clocks, alarms, immobilizers and trackers. When the vehicle is not being used regularly the alternator doesn't get a chance to top the battery up. Returning from holiday to discover a flat battery is less than ideal. This solar panel will trickle charge your vehicle's battery, helping compensate for electronic drain and natural wastage. Ideal for cars, motorcycles and other small vehicles. Suitable for all 12V lead acid batteries, Simple plug 'n' play connection to your battery, LED charging indicator, Suction cups for windscreen mounting, Connect via croc-clips or cigarette lighter adapter, Supplied with 2.5m extension lead. If the battery to be charged is less than 35Ah a solar charge controller should be connected if leaving attached to the battery indefinitely.