CTEK Indicator Eyelet M8 LED battery charge indicator — 8 mm eyelet, permanent mount for 12V batteries

CTEK Indicator Eyelet M8 is a permanent 8 mm eyelet connector with a three‑color LED that shows the charge status of 12V lead‑acid batteries and provides a ready, secure hookup for CTEK chargers up to 10A.

Designed to solve the problem of hard‑to‑reach battery terminals, the Indicator Eyelet M8 combines a durable eyelet connection with a simple traffic‑light LED display so you can see at a glance whether a battery needs charging. It fits vehicles and equipment that use 12V lead‑acid batteries and is built to withstand workshop and outdoor conditions while remaining compatible with CTEK charging systems.

How does the LED display tell me when to charge?

The indicator uses three distinct LED colors to make battery status obvious without tools. Red flags a low charge, yellow signals a partial charge, and green shows the battery is sufficiently charged.

• Red LED: battery charge below ~60% — charging recommended.
• Yellow LED: battery charge between ~60–80% — charge soon if vehicle will be stored or under heavy use.
• Green LED: battery charge above ~80% — ready for normal use.

Can I leave the eyelet connected permanently?

Yes — the M8 eyelet is made for a semi‑permanent installation so you can easily access batteries that are recessed or covered. It includes an end cap to protect the connector from dirt and corrosion when not being used.

• 8 mm eyelet ensures a secure, low‑resistance connection to the battery post.
• End cap preserves connector condition and prevents accidental shorting.
• Flexible, wear‑resistant cable routed for repeated use and harsh environments.

Will this work with my battery and charger?

The indicator is compatible with all 12V lead‑acid battery types and pairs with CTEK chargers rated up to 10A. It works with typical lead‑acid chemistries used in cars, motorcycles, boats, and many powersport and utility applications.

• Compatible with 12V lead‑acid batteries (including AGM and standard wet cells).
• Safe to use with CTEK chargers up to 10A for monitoring and charging.
• Designed and tested in Sweden for consistent performance.

What about durability and warranty?

The Indicator Eyelet M8 uses robust components and flexible cables that stand up to workshop and outdoor conditions. CTEK provides a limited warranty to cover manufacturing defects, and the product is manufactured to high quality standards.

• Durable housing and cable designed for repeated connection cycles.
• Corrosion‑protected eyelet and protective end cap for longevity.
• Covered by CTEK’s 2‑year warranty; follow retailer return policies for claims.

Who is this for? The CTEK Indicator Eyelet M8 is intended for vehicle owners, fleet managers, marine enthusiasts, and equipment operators who need a reliable, visible way to check battery condition without removing covers or accessing awkward terminals. It suits anyone who wants a simple, low‑maintenance battery monitoring solution that integrates with CTEK chargers and keeps batteries ready for use.