CTX INDICATOR EYELET M8, 40-133 | ctek.com


Practical for those batteries that are difficult to access. Shows the battery’s charge level simply and clearly. It comes with a 2-year warranty.

Part no. 40-133

Eyelet connection provides a permanent and secure connection for hard-to-reach batteries. Featuring CTEK’s unique CONNECT system, the INDICATOR EYELET M8 provides a quick, secure and easy way to charge your battery.

Durable designed and tested in Sweden, with hardwearing and flexible cables that are built to last.

Compatible works with all 12V lead-acid batteries, and with CTEK chargers up to 10A


Checks charge status of hard to reach batteries, M8 8.4mm eyelet

Indicator is the easiest way to monitor the charge in your battery. An accurate reading for your battery is displayed two hours after you’ve used your vehicle.


  • Red: means the battery charge is below 12.4 V. It’s definitely time to charge the battery.
  • Yellow: means the battery charge is between 12.4 and 12.65 V. It’s time to start thinking about charging the battery.
  • Green: means the battery charge is more than 12.65 V. OK! No need for charging.

Connect with CTEK on Socials

Are you interested in learning more about the CTEK brand, maximizing battery performance or sustainable charging? Follow us on @ctekcharging for inspiring updates and the latest news on our products and battery management solutions.