CTEK CS FREE awarded Auto Express product of the year USA - English Share this article Share this article VIKMANSHYTTAN, Sweden, May 17, 2021 /PRNewswire/ -- CTEK, a leading global brand in vehicle charging solutions, is celebrating after being awarded the Auto Express product of the year for its groundbreaking new product the CS FREE. CTEK CS FREE: battery charger and maintainer with revolutionary Adaptive Boost technology (PRNewsfoto/CTEK) The CTEK CS FREE the world's first multi-functional portable charger, was commended for its revolutionary Adaptive Boost technology, that gets your car going from a flat battery within 15 minutes, its ability to top-up a little-used car stored away from mains power, and clever introduction of accessories to enable off-grid charging via solar power or a second 12V service battery.