The CTEK CS Free is a portable, 4-in-1 battery charger, maintainer, adaptive booster, and power bank designed primarily for automotive use. It works as a smart solution to keep your 12V batteries (both lead-acid and lithium) in top condition, even when off-grid. Its robust adaptive boost technology can bring a dead battery back to life in just 15 minutes without damaging electronics, which sets it apart from traditional jump-starters.
What makes the CS Free stand out is its ability to operate entirely off-grid, using solar panels or other power sources to charge its internal battery. With additional USB-A and USB-C outputs, it also doubles as a power bank for devices like smartphones, laptops, and even RC battery chargers, making it a multi-functional tool.
Though designed for full-size vehicles, we’ve found…