CTEK 40-133 Start/Stop CT5 Indicator Eyelet M8: A Battery Monitoring Solution

CTEK 40-133 Start/Stop CT5 Indicator Eyelet M8 – A Reliable Battery Monitoring Solution

Keeping track of your vehicle’s battery health has never been easier with the CTEK 40-133 Start/Stop CT5 Indicator Eyelet M8. Designed for convenience and efficiency, this compact yet powerful accessory ensures you always know the status of your battery at a glance. Whether you own a modern start/stop vehicle or a classic car, this indicator provides peace of mind with its straightforward LED display.

Key Features & Benefits

1. Clear Visual Indicator
   The CTEK 40-133 features an easy-to-read LED display with three distinct colors:

   • Green – Battery is fully charged and in good condition.
   • Yellow – Battery requires attention (partial charge).
   • Red – Immediate charging needed (low charge).

   This intuitive system allows drivers to quickly assess their battery’s state without needing additional tools or diagnostics.

2. Durable & Secure Connection
   The M8 eyelet terminal ensures a solid and corrosion-resistant connection to the battery. The included protective end cap keeps the connector clean and prevents accidental short circuits when not in use.

3. Compatibility with CTEK Chargers
   Designed to work seamlessly with CTEK battery chargers, this lead allows for effortless connection, making maintenance charging a breeze. The 50cm cable length provides flexibility for routing to accessible points under the bonnet.

4. Easy Installation
   Simply attach the eyelet to the battery terminal, and the indicator is ready to use. The compact design ensures it doesn’t interfere with other engine components.

What Customers Say

Many users appreciate the CTEK 40-133 for its reliability and ease of use. One satisfied customer noted:

“This is a fantastic little device. I fitted it to my classic car, and now I can check the battery health in seconds. The LED display is bright and clear, and the connection is solid.”

Another reviewer highlighted its practicality:

“Perfect for my Porsche, which sits unused for weeks. The indicator lets me know when to plug in the charger, avoiding any nasty surprises.”

Final Verdict

The CTEK 40-133 Start/Stop CT5 Indicator Eyelet M8 is an excellent addition for any vehicle owner who values battery health monitoring. Its robust build, clear LED display, and compatibility with CTEK chargers make it a must-have for both daily drivers and seasonal vehicles.

For those looking for a hassle-free way to keep their battery in top condition, this product delivers on all fronts.

ASIN: B015352MQQ

CTEK 40-133 Start/Stop CT5 Indicator Eyelet M8

£16.88 £15.59 (as of December 11, 2025 09:37 GMT +00:00 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)

Easy to read display Comes standard with an end cap attached to ensure the connection stays in good condition Easily connects to batteries which are often difficult to gain access to Easy to install All CTEK products are backed by our 1 year manufact... read more

CTEK MXS 5.0 Battery Charger with Automatic Temperature Compensation, Black & 40-133 Start/Stop CT5 Indicator Eyelet M8, Green,Red,Yellow

10% Off £107.88 £96.83 (as of December 11, 2025 09:37 GMT +00:00 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)

Product 1: Simple to connect and easy to use: fully automatic, spark free, reverse polarity protected Product 1: Tough and reliable: Designed for outdoor use at any temperature; Developed and tested in Sweden Product 1: Flexible: compatible with many... read more

CTEK 56-629 Indicator eyelet M6: practical LED indicator for immediate indication of battery charge levels

38% Off £12.99 £7.99 (as of December 11, 2025 09:37 GMT +00:00 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)

15A (blade type) fuse Compatible with: XS 0.8, MXS 3.6, Multi XS 4003, MXS 7.0, M45, M100 Back current drain - ~1Ah / Month 10A maximum current Minus 20°C to Plus 50°C temperature range

CTEK 40-134 Start/Stop CT5 Connect Extension, 2.5 m & 56-382 Vehicle Battery Charger Comfort Indicator, Red/Black

9% Off £30.88 £27.98 (as of December 11, 2025 09:37 GMT +00:00 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)

Product 1: Useful 2.5 metre extension cable Product 1: Can be used on all CTEK chargers up to 10A Product 1: Can be used on clamps and other quick accessories Product 2: Quick indication: LED traffic light system to show battery charge levels, so you... read more

CTEK 40-134 Start/Stop CT5 Connect Extension, 2.5 m & 40-165 Battery charge indicator with 12 V Comfort connector 22 cm

Now retrieving the rating.

13% Off £34.38 £29.89 (as of December 11, 2025 09:37 GMT +00:00 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)

Product 1: Useful 2.5 metre extension cable Product 1: Can be used on all CTEK chargers up to 10A Product 1: Can be used on clamps and other quick accessories Product 1: Model number: 40-134 Product 2: Cable length: 8.5 cm Product 2: Universal model ... read more

CTEK 56-531 6899 & 40-134 Start/Stop CT5 Connect Extension, 2.5 m

Now retrieving the rating.

11% Off £49.48 £43.90 (as of December 11, 2025 09:37 GMT +00:00 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)

Product 1: Led indicator that allows you to quickly check the condition of your battery it's designed to be neatly and neatly installed in a vehicle panel for permanent connection to the battery Product 1: Easily connect your ctek charger if the batt... read more

CTEK CS ONE Battery Charger and Maintenance Device with APTO Technology & 56-382 Indicator Eyelet M8: Practical LED Indicator for Immediate Battery Charge Levels, Red/Black

Now retrieving the rating.

28% Off £231.89 £166.94 (as of December 11, 2025 09:37 GMT +00:00 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)

Product 1: Super Smart and Super Simple - no buttons to press or modes to select – simply connect to any 12V lead-acid or lithium (LiFePO4) battery and leave it to do its work Product 1: Adaptive Charging Technology (APTOTM) - automatically works out... read more

CTEK CT5 Time To Go Battery Charger And Maintainer, Know When The Battery Will Be Charged Fully automatic.

£54.54 (as of December 11, 2025 09:37 GMT +00:00 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)

The only charger the world that indicates how many hours remain until the battery is fully charged. THE device indicates when a start attempt can be performed and when the battery will be really full. The CT5 Time To Go charger can remain connected f... read more

CTEK (40-255) CT5 Time to Go 12 Volt Battery Charger and Maintainer with Accessories

Now retrieving the rating.

£101.71 (as of December 11, 2025 09:37 GMT +00:00 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)

Charges batteries up to 110Ah. Maintains larger batteries up to 160 Ah Simple to connect and easy to use: fully automatic, spark *************************************************************, reverse polarity protected Tough and reliable: designed fo... read more

CTEK 40-362 MXS5.0 Value Pack, containing MXS5.0 Charger, protective Bumper, Comfort Connector and a FREE 5000mAh power bank

Now retrieving the rating.

£134.21 (as of December 11, 2025 09:37 GMT +00:00 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)

Features the best selling CTEK MXS 5.0 Intelligent charger Free 5000mAh Power Bank Contains a protective Bumper Pack comes with M8 Comfort Connector everything you need to keep your car battery maintained