The CTEK CS FREE is a four-in-one portable device that works as a 12V battery charger, maintainer, adaptive booster, and USB power bank. Its Adaptive Boost technology safely revives a flat battery, even one that has dropped very low, without the voltage spikes that can damage vehicle electronics, and it does this cordlessly without a wall outlet. It delivers up to 20A and 240W to a 12V battery, charges and maintains batteries from 10 to 130Ah across WET, MF, Ca/Ca, AGM, EFB, GEL, and LiFePO4 types, and carries a 66Wh lithium-ion power bank with USB-C and USB-A outputs for phones and laptops. The unit itself recharges over USB-C from a wall adapter, a 12V socket, a solar panel, or a service battery, and it is rated IP54. CTEK backs it with a 2-year warranty.
- Type: 4-in-1 portable charger, maintainer, booster, and power bank
- Adaptive Boost safely revives flat 12V batteries cordless
- Output: up to 20A / 240W to a 12V battery
- Charges and maintains 10-130Ah
- Battery types: WET, MF, Ca/Ca, AGM, EFB, GEL, LiFePO4
- 66Wh Li-ion power bank with USB-C and USB-A outputs
- Recharges via USB-C (wall, 12V socket, solar, or service battery), IP54
- Warranty: 2 years
- Part number: CTEK40-462
FAQ
What does the CTEK CS FREE do?
It is a four-in-one 12V battery charger, maintainer, adaptive booster, and USB power bank in one portable unit.
Can it revive a dead battery without a wall outlet?
Yes. Its Adaptive Boost technology safely revives a flat 12V battery cordlessly, without damaging vehicle electronics.
What batteries does it support?
12V batteries from 10 to 130Ah, including WET, MF, Ca/Ca, AGM, EFB, GEL, and LiFePO4 types.
How is the CS FREE itself recharged?
Over USB-C from a wall adapter, a 12V socket, a CTEK solar panel, or a service battery. It also has a 66Wh power bank for USB devices.
