The first truly cordless 12V charger
The CTEK CS Free stands apart: a fully portable 12V battery charger, able to charge and maintain a battery with no mains socket nearby, thanks to an internal lithium battery that acts as an energy reservoir.
Adaptive Boost, more than a simple jump starter
Unlike a standard jump starter that sends a current spike, Adaptive Boost continuously analyses the flat battery's state and delivers current progressively, up to 20A, to bring it to a level that allows starting. The stated result is a restart in 10 to 15 minutes, an approach that actually recharges rather than just forcing a one-off start.
A 4-in-1: booster, charger, maintainer, power bank
Its USB-C and USB-A ports let you recharge a smartphone, tablet, or laptop, making it valuable while camping or in a converted van. It's compatible with all 12V lead-acid or lithium batteries up to 130Ah, and recharges itself via mains, a 12V car outlet, or an optional solar panel. Once charged, it holds its energy for up to a year.
Price and weight, the real trade-offs
The CS Free owns its limitations: its price runs well above a standard maintainer, and its weight, from the internal battery, is noticeable next to a small garage charger.
Who the CS Free is for
This charger suits anyone needing to charge a 12V battery far from any socket: a converted van, a motorhome, a car or motorcycle parked somewhere with no power, nomadic use. For standard garage maintenance with mains access, a maintainer like the CTEK PRO25S or the Bosch C30 remains more affordable and just as effective.
