CTEK CS FREE portable smart battery charger

SKU: 40-462



or 4 interest-free installments of $125.00
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CTEK CS FREE is the world’s first truly portable battery charger and maintainer with Adaptive Boost technology. You can charge and maintain any 12V lead acid or lithium vehicle battery anywhere without being connected to a power outlet. And if your battery’s flat, CS FREE’s revolutionary Adaptive Boost technology will get you going within 15 minutes.

Portable charging wherever you go, 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 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.


  • Portable charging and maintaining you can take anywhere without being tied to a power outlet
  • Internal battery lasts up to a year when fully charged
  • Adaptive Boost, to safely get you going from a flat battery within 15 minutes
  • Can be charged up and powered by solar or 12V battery for longer term maintenance charging
  • No modes to select – just turn it on, connect and the CS FREE will do the rest
  • Countdown function shows you how long there is left before your battery is fully charged
  • USB-C and USB-A outputs for charging tech like laptops, smartphones and tablets
  • New ergonomic design with a tough and durable case

Battery Capacity


Charging Category

AC Charging; DC Charging

Battery Voltage


Battery Chemistry

Lead Acid; Lithium-ion

Ambient Storage Temperature

-20°C to +45 °C (-4 °F to +113 °F)

Ambient Operating Temperature

-20 ˚C to +50 ˚C (- 4 °F to +122 °F)


Natural Convection

Start Voltage





USB-C, 5VDC-25VDC, 3ADC/60W Max


12V, 20A/240W Max

Battery Types

12V, WET, MF, Ca/Ca, AGM, EFB, GEL, LifePO4

Rated Voltage (Input)

100VAC – 240VAC

Degree of Protection



248 x 98 x 78mm

Enclosure Material


Net Weight (unit with cables)

1.4 kg

User Interface

LED Symbols

Detachable Charging Cable Length


Internal Battery Capacity

66 Wh

Internal Battery Cell Chemistry

Polymer Lithium-Ion

Internal Battery Cell Type

Pouch Cell

Internal Battery Charge Temp.

0˚C to +45˚C (32˚F to 113˚F)

Internal Battery Discharge Temp.

-20 ˚C to +50 ˚C (- 4 °F to +122 °F)

Internal Battery Life Span

300 Cycles, 80%

Internal Battery Shelf Life

1 Year

Internal Battery Weight

0.5 kg

Mains Adaptor Cable Length


Mains Adaptor Cable Type


USB-A Output

5 VDC, 2.4 ADC/12 W max

USB-C Output

5 VDC, 9 VDC, 12 VDC, 15 VDC, 20 VDC, 3 ADC/60 W max

Mains Adapter Input

100 VAC – 240 VAC, 50 Hz – 60 Hz, 60 W max

Mains Adapter Output

USB-C, 5 VDC – 20 VDC, 3 ADC, 60 W max


USB-C Input

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Prices may be higher due to freight (North & South island prices may be different), packaging and insurance in some areas. Accessories shown for illustration purposes only. Pictures may show optional extras. Not all stock carried at all stores but orders welcome. We reserve the right to limit quantities and correct pricing errors. Stocks available until sold out. All prices are inclusive of GST. No responsibility is taken for stock unavailability due to supplier issues. All prices subject to change without prior notice.

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