Just charge up CS FREE's internal battery and keep it with you wherever you go, and it'll stay fully charged for up to a year. CS FREE features our revolutionary Adaptive Boost technology to quickly get you going from a flat battery. CS FREE automatically analyses the state of your battery and adjusts to the battery's voltage level. It then works out the safest and quickest way to give your battery the power it needs to start your vehicle within 15 minutes. CS FREE works anywhere and can even be powered by solar or a 12V battery for longer term maintenance charging. The CS FREE is the world's first fully portable battery charger and maintainer with Adaptive Boost to get your flat battery going quickly and safely without the need for mains power. In other words, it's a 12V power bank for your vehicle that works with both lead-acid and lithium (12V LiFePO4) batteries. Plus, it'll keep your portable tech, like phones, laptops & cameras topped up too. So simply charge it up, take it with you and use it anywhere! QUICK TO GET YOU GOING The CS FREE is a portable Adaptive Booster that will get you going from a flat battery within 15 minutes. CHARGE IT UP! Just charge up the CS FREE's internal battery and you ve got a 12V power bank that will stay fully charged until you need it for up to a year. And with USB-C connectivity, you can fully recharge your CS FREE in just one hour! NO POWER? NO PROBLEM! If you have a car, a motorcycle, a boat or any other 12V vehicle and want to charge and maintain for longer periods of time... well no worries!