Ctek 40-331 CS One UK

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  • Regular price £209.95


Charging any battery just got a whole lot simpler with the CTEK CS ONE. Its revolutionary APTO™ (Adaptive Charging) technology does all the thinking for you – you don’t even have to worry about which clamp goes where! This is the easiest charger you’ll ever use. Add in dedicated app control, to unlock additional features and you’ve got the most advanced charger available today. Super simple. Super smart. Simply CS ONE.


Revolutionary adaptive battery charger and maintainer

APTO™ Technology automatically recognises the type of battery you’re using, and then automatically delivers a customised charging program, telling you how long until the battery is charged and ready to go. No buttons to press or modes to select – just connect the CS ONE to any 12V battery and simply charge. Polarity free clamps mean you don’t even need to worry about which clamp goes where, so you’ll never make a wrong connection again. The clamps are spark free too, so don’t worry if you accidentally touch them together. Unlock additional features using the Bluetooth® enabled CTEK App. Select ‘RECOND’ to restore and recondition your battery. Choose ‘WAKE UP’ for lithium batteries with under voltage protection or to bring deeply discharged lead-acid batteries back to life. Select ‘SUPPLY’ to turn the CS ONE into a useful 12 V supply. You can also monitor the voltage and amps being delivered by the charger.


  • RECOND option to restore and recondition lead-acid batteries.
  • WAKE UP option to revive seemingly dead lithium and lead-acid batteries.
  • 12V SUPPLY to support the battery during service work and retain contact power to the vehicle during battery replacement / removal.
  • ADVANCED SETTINGS to monitor charger voltage & amperage.
  • Can be left safely connected for long periods during maintenance charging.
  • New durable design to make it easy to handle, with unique mounting system on the back for quick connection to CS accessories.
  • 5 year warranty.

Charge up with CS ONE. Plug in to brain power


Get to know the CTEK CS ONE – the revolutionary battery charger and intelligent maintainer with APTOTM (Adaptive Charging) technology. Hands down the most innovative battery charger ever engineered by CTEK, CS ONE comes to you with cutting-edge APTOTM technology that’s so advanced it does all the thinking for you. 

This is the ONE battery charger capable of delivering a whole new dimension of smartness and simplicity. ONE so ground-breaking, it supports polarity-free charging. ONE you simply plug in to the mains, attach to any 12V battery and rely on to deliver consistently optimal performance. We call that pure brain power, wouldn’t you?

Technical data

Battery capacity
3–180 Ah
Battery capacity CEC-400
3–180 Ah
Charging category
AC charging
Back current drain*
Corresponding to less than 1.5 Ah/month
Battery voltage
12 V
Battery chemistry
Lead acid; Lithium-ion
Ambient operating temperature
-30 °C to +50 °C
Natural convection
220–240 VAC, 47–63 Hz, 1.2 A
12 V, 8.0 A
Start voltage
1.5 V lead-acid battery types. 1.5 V LiFePO₄.
50 Hz
Less than 4 %
Battery types
12 V:; WET; MF; Ca/Ca; AGM; EFB; GEL; LiFePO₄
Temperature compensation
Built in charge voltage compensation according to ambient temperature.
ETSI EN 300 328; RED; EN 61000-6-3; EN 61000-6-1; ETSI EN 301 489-1; ETSI EN 301 489-17; EN 60 335-2-29; EN 60335-1; SS-EN ISO 13732-1:2008
Enclosure material
Rated voltage (Input)
230 V
Degree of protection
Mains cable length (input)
1.4 m
App support
CTEK App for Android and IOS
Dimensions (L x W x H)
235 x 88 x 52 mm
Net weight (unit with cables)
0.675 kg
User interface
LED symbols; Smartphone display (free of choice)
Detachable charging cable length (ouput)
2 m
Packaging size (L x W x H)
288 x 178 x 55 mm
5 years
Warranty, info
Limited Warranty
Power plug type
Type G