Skip advert
Advertisement

CTEK CS One Gen 2 battery charger review

CTEK’s CS One Gen 2 is one of the very best chargers you can buy, but you’ll pay for the privilege

CTEK CS ONE Gen2 - on engine
Overall Auto Express rating

3.5

  • Price: around £199  
  • Contact: ctek.com

There are 12V battery chargers available to buy for less than £20, so we were keen to see why CTEK’s new CS One Gen 2 could possibly be worth 10 times that. 

It certainly has some features that are impressive, the most obvious of which is the foolproof automation. Instead of the usual black and red leads for the negative and positive terminals, CTEK’s newcomer senses which way to send the power. This is especially useful when dealing with batteries that don’t have clear markings, such as on a classic.

Advertisement - Article continues below

The sensors can also tell what type of battery is being connected. The CTEK uses technology to identify the chemistry, size and condition automatically, without the need to select settings yourself.

There are two settings which still must be manually selected though, but you don’t need to use anything as mundane as buttons on the charger. If you want to revive an apparently dead battery, the CTEK will need to have a WAKE UP mode selected. 

CTEK CS ONE Gen2 - app

There is then a RECOND phase to restore the cells to health using special charging patterns. To access these modes, the CS One Gen 2 connects to your WiFi network or via Bluetooth, and can then be controlled and monitored via an app on your smartphone. It will even alert you using push notifications when the battery is charged. 

We charged three batteries of different sizes and types and the unit worked well, restoring them all to 100 per cent in a few hours and updating us via the app. It means the CTEKis clever and represents a useful advance in charger tech, but only those who demand the very best and latest gadgets will stomach the cost.

Buy now from Amazon

Did you know you can sell your car through Auto Express? We’ll help you get a great price and find a great deal on a new car, too.

Skip advert
Advertisement

New & used car deals

Audi A3

Audi A3

RRP £30,210Used from £9,995
Volkswagen Polo

Volkswagen Polo

RRP £15,270Avg. savings £2,942 off RRP*Used from £6,460
MG MG4

MG MG4

RRP £27,005Avg. savings £3,637 off RRP*Used from £8,695
Dacia Spring

Dacia Spring

RRP £11,990Avg. savings £703 off RRP*Used from £9,495
* Average savings are calculated daily based on the best dealer prices on Auto Express vs manufacturer RRP
Skip advert
Advertisement

Most Popular

New Ford Fiesta ST: ‘non-negotiable’ return of an iconic hot hatch
Ford Fiesta ST render (watermarked) - front

New Ford Fiesta ST: ‘non-negotiable’ return of an iconic hot hatch

Fast Fords are ‘non-negotiable’, the first could be a return of the hot Fiesta ST supermini
News
21 Aug 2026
New Audi A3 to stick with petrol and target big quality boost
Audi A3 render (watermarked) - front

New Audi A3 to stick with petrol and target big quality boost

The popular hatchback is set to be reborn with a new look, higher quality and cutting- edge tech as Audi looks to lead the premium car class
News
24 Aug 2026
Zip-merging is fairer, faster and recommended by all the experts. So why do UK drivers refuse to do it?
Steve Walker zip-merging

Zip-merging is fairer, faster and recommended by all the experts. So why do UK drivers refuse to do it?

Steve Walker is completely flummoxed as to why UK drivers can’t get their heads around this simple principle.
Opinion
21 Aug 2026