Yuasa Starter battery 12V 100Ah - M31-100S for marine applications

The YUASA M31-100S is a powerful and robust starter battery specially designed for use in boats, yachts and other marine vehicles. With a capacity of 100 Ah, a high cold cranking current of 750 A (EN) and a resistant design, it offers reliable starting performance even under demanding conditions at sea.

Highlights at a glance

• High cold cranking current: 750 A (EN), 960 A MCA – ideal for powerful diesel engines
• Durable & safe: Maintenance-free calcium-calcium technology with flame protection
• Robust housing: GR31 format with integrated carrying handle and charge status indicator
• High energy reserve: 1200 Wh for reliable starting and onboard power supply
• Marine optimised: Semi-traction capabilities and double-walled SMF lid

Reliable starting under all conditions

The M31-100S delivers a strong starting performance for boat engines with 750 A cold cranking current (EN1) or 960 A Marine Cranking Amps (MCA). Even at low temperatures, the battery ensures reliable starting behaviour, ideal for sailing and powered yachts with high energy requirements when starting.

Robust, maintenance-free and seaworthy

Thanks to the proven calcium-calcium technology (Ca/Ca), the M31-100S is absolutely maintenance-free. The SMF double lid (Sealed Maintenance Free) with integrated end degassing and flame protection ensures maximum safety at sea. The PE separators protect the cells from internal short circuits and promote cycle durability, even in semi-traction use.

Comfortable handling and easy monitoring

The battery is equipped with practical carrying handles and has an integrated charge status indicator that allows visual monitoring of the battery at any time. With a recommended charging current of 5 A, it can easily be recharged via external chargers.

FAQs about the Yuasa M31-100S marine starter battery

For which marine applications is the M31-100S suitable?

The M31-100S is ideal for starting boat engines (petrol and diesel) and at the same time reliably supplies onboard electronics with energy. It is suitable for sailing boats, sports boats, yachts and other marine vehicles.

What is the starting power of the battery?

The battery provides 750 A to EN1 and 960 A MCA, so it delivers a reliable starting impulse for powerful engines even at low temperatures.

Is the battery maintenance-free?

Yes, the Yuasa M31-100S uses calcium-calcium technology and is completely maintenance-free. No topping up with water is required.

Does the battery have safety features?

Yes, it is equipped with flame protection, end degassing system and a double-walled SMF lid. In addition, the housing is reinforced for marine use.

How can I check the charge status?

The battery has an integrated charge status indicator for quick visual inspection.

What special design features does the model offer?

It features a Vibrolock housing for vibration resistance, has a double, leak-proof lid, integrated flame arrestor, carrying handles and end-side degassing.