12V 70Ah Start-Stop AGM Battery

The most important factor is making sure the battery matches your vehicle’s required type and specifications. Start-stop cars are designed to work with either AGM (Absorbent Glass Mat) or EFB (Enhanced Flooded Battery), and using the wrong type can reduce performance or even disable the system. Once the type is confirmed, check that the size, terminal layout, and Cold Cranking Amps (CCA) meet or exceed your original battery, as this ensures proper fit, safe installation, and reliable starting power.

A Battery Size Chart is a guide that lists the key specifications of different battery models so customers can compare and choose the right one. Each column on the chart usually represents:
Group/Size Code—the standardized code that indicates the overall case dimensions.
Dimensions (L × W × H)—the physical size of the battery to ensure it fits in the vehicle’s tray.
Capacity (Ah or RC)—how much energy the battery can store, affecting how long it can support electrical systems.
Cold Cranking Amps (CCA)—the ability to start the engine in cold weather.
Terminal Type & Position—the shape and location of the positive and negative terminals.

The voltage should almost always be 12V for passenger cars. The capacity (Ah) should match or be slightly higher than the original battery to ensure enough energy for repeated starts. The cold cranking amps (CCA) should be equal to or higher than the original rating—higher CCA provides more reliable starts in cold weather. The battery group size must match the original so it physically fits in the tray and connects properly to the terminals. As for battery type, vehicles originally equipped with AGM must be replaced with AGM, while those with EFB can be replaced with either EFB (standard) or AGM (upgrade). By following these values, you ensure both compatibility and optimal performance.

Unstable voltage fluctuations in a start-stop vehicle are often caused by an aging or weak battery, poor connections, or issues with the charging system. To address this, first check that the battery terminals are clean, tight, and free of corrosion, as loose connections can create unstable voltage. Next, test the battery’s state of health (capacity and CCA)—if it is below the recommended level, replacement may be necessary. Also, ensure the alternator or DC-DC converter is functioning properly, since a weak charging system can cause irregular voltage supply. Finally, verify that the battery type matches your vehicle’s requirements (EFB or AGM), because using the wrong type can lead to unstable performance. If fluctuations persist after these checks, professional diagnostics may be needed to rule out wiring or sensor issues.

A car battery may be failing if you notice multiple warning signs. The engine may crank slowly or fail to start, often accompanied by clicking sounds. Dashboard warning lights, such as the battery or check engine indicators, may appear. Electrical systems like headlights, power windows, or infotainment may behave erratically or dim. In start-stop vehicles, the system may stop working unexpectedly. Physical signs can include corrosion or buildup on the battery terminals, swelling, or leakage from the battery case. Frequent need for jump-starts is another strong indication that the battery can no longer hold sufficient charge. Early detection of these issues can prevent being stranded and protect your car’s electrical components.