Our solar battery charger is essential if you have seasonal vehicles that sit for months without being used. With this unit, your vehicle's battery will still be as fresh as the day you left it. It's designed to fully charge a battery and maintains it at a proper storage voltage with free energy source - the sunlight (up to 20% photoelectric conversion rate). IP68 waterproof, heat-resistant material and dual max 5V/3A USB charging ports feast it to be popular among travelers, outdoor activities lovers and automobile owners. 30? bendable can meet a wide range of applications where standard panels can be inconvenient to mount, such as on the curved roof of an airstream.