Dynac 012AGM Automotive Stop/Start Battery 550901054 50Ah 540A

McMartins: Powering Your Journey, Inside and Out

As a family-run business, we leverage a legacy of technical expertise that stretches back to 1972 to supply you with the best parts and accessories.

Our team have supplied garages and retailers across the UK - and now we’re bringing the same quality of products and expertise directly to motorists.

Family‑run, UK‑based specialists. Trusted by consumer and trade. Delivered to your door.

Download Our Intro Pack

McMartins is a forward-thinking automotive parts and accessories retailer built on a foundation of technical expertise, quality products, and unwavering commitment to the customer. While our name is synonymous with battery excellence - the critical power source for every vehicle - we have grown to become a comprehensive partner for all your car care, maintenance, and enhancement needs.
We serve the everyday driver, the dedicated DIY mechanic, and professional repair shops alike, ensuring every vehicle gets the power and parts it needs to perform reliably.

Our Core Pillars: The McMartins Difference

Our business model is built on three essential pillars that guide every decision, from product selection to customer service:

1. Battery Mastery: The Heart of Our Business

• Deep Expertise: Our initial focus and enduring strength is in power solutions. We stock a vast array of batteries for everything from standard combustion engines and high-demand modern vehicles to specialized batteries for motorcycles, boats, and electric vehicle (EV) auxiliary systems.

• The Right Fit Guarantee: We utilize advanced fitment technology to ensure every customer is matched with the exact CCA, Group Size, and technology (Lead-Acid, AGM, EFB, Lithium) required by their specific vehicle.

• Sustainability Focus: We are committed to responsible battery life cycle management, offering robust battery testing and free, ethical recycling services for old units.

2. Curated Quality Parts: Reliability First

• Essential Maintenance: We supply the parts you need to keep your car safe and running smoothly, including:

  • Batteries: Traditional Led-Acid, Lithium and more.

  • Battery Chargers

  • Jump Starters

• Vetted Suppliers: Unlike general retailers, we partner only with trusted, industry-certified manufacturers to guarantee the quality and durability of every component we sell.

3. Smart Accessories & Tools: Empowering the Driver

• Modern Automotive Life: We stock a range of accessories that enhance both the driving experience and the garage workflow.

• Product Categories Include: Battery chargers and jump starters, portable power packs, high-performance lighting, and premium diagnostic tools for the DIY market.
  

Our Customer Commitment: Service, Simplified

At McMartins, we understand that car maintenance can be confusing and intimidating. We strive to make the process as straightforward and stress-free as possible.

The easiest way to find the right battery is using our Yuasa Battery Finder. However, here are some extra steps to verify you are making the right choice:

Step 1: Check Your Owner's Manual - The Definitive Source

Your car's owner's manual is the most accurate and reliable source for battery information. Don't skip this step if you have access to it!

Step 2: Look at Your Current Battery

If you don't have your owner's manual, you can look at your current battery. Most batteries have a label that indicates the group size and CCA. Make sure to note these details down.

What to Look For:

• Battery Group Size: This is a crucial physical dimension that ensures the battery fits securely in your car's battery tray and that the terminals are in the correct position relative to your cables. Common group sizes include 24, 24F, 34, 35, 51, 51R, 58, 65, 75, and 78.
  With Yuasa this forms part of the part number, for example: the last 3 digits of YBX9096 is Battery Group 096. The first digit is the product range (e.g. YBX 9000 series).

• Cold Cranking Amps (CCA): This rating indicates the battery's ability to start your engine in cold temperatures. It's the number of amps a 12-volt battery can deliver at 0°F (-18°C) for 30 seconds while maintaining at least 7.2 volts. Higher CCA is generally better, especially in colder climates.

• Voltage: Most modern car batteries are 12-volt.

• Terminal Location and Type: Confirm if your battery has top posts, side posts, or a combination, and where they are located.

Common Mistakes to Avoid:

• Guessing: Never assume you know the correct specifications. Always verify them.

• Ignoring Group Size: Buying a battery with the wrong group size can lead to it not fitting, or the terminals being too far from your car's cables.

• Overlooking CCA for Climate: If you live in a cold region, under-specifying CCA can lead to starting problems in winter.

Learn how to change your car battery yourself with our step-by-step guide! But be careful, on modern vehicles with advanced technology, it may require special tooling and information. Watch our video to find out more and visit fit.yuasa.com or fit.gs-battery.com for specific instructions for your vehicle.

Timestamps

• 00:00 - Introduction
• 00:20 – Battery replacement for hybrid and electric vehicles
• 00:55 – Starter battery replacement introduction
• 01:27 – Finding the right battery
• 01:41 – Technology and specification
• 01:54 – Reprogramming requirements
• 02:04 - Vauxhall Mokka battery replacement demo