Start with what fits your vehicle. Battery “group size” refers to the case dimensions and terminal layout, using codes like 24F, 35, 65, 78, 51/51R, 96R, or H5/H6/H7 (47/48/94R). Many automotive batteries on this page are 12 Volt and shown in those common sizes.

• Check your owner’s manual or the label on your current battery for the exact group size.
• Match terminal position and orientation (for example, 51 vs. 51R).
• Confirm the hold‑down type and height clearance in your battery tray.
• Select a starting power rating (such as CCA) that meets your vehicle and climate needs.

When in doubt, bring your existing battery’s specs with you or consult a qualified technician to confirm fitment.

These ratings describe performance, and choosing the right mix can help your battery work better for your needs.

• CCA (Cold Cranking Amps): Indicates starting power in colder conditions. Higher CCA can be helpful in cold climates or with higher‑demand engines.
• MCA (Marine Cranking Amps): A similar starting rating used for marine applications, typically measured at warmer temperatures. You’ll see MCA on marine starting batteries.
• RC (Reserve Capacity): Describes how long a charged battery can power essential systems if the charging system isn’t providing current.

Match or exceed the original equipment ratings recommended in your owner’s manual. On this page, you’ll find automotive batteries rated in CCA, marine options listed with MCA, and several with RC specified.

Both are 12 Volt automotive batteries, but they’re built differently.

• AGM (Absorbent Glass Mat): Sealed design that’s spill‑resistant and generally handles vibration well. It can be a good fit for vehicles with higher accessory loads or systems that cycle the battery more frequently. Some vehicles specifically require AGM.
• Flooded (conventional lead acid): Common and widely used for standard starting needs.

Always follow your owner’s manual: use AGM if it’s specified, and ensure your charging system is compatible before switching types. This page includes both styles in popular group sizes (for example, H5/H6/H7 and 65), so you can match the required type, size, and starting power for your vehicle.

They’re designed for different jobs on the water or in RVs.

• Marine/RV deep cycle: Built to deliver steady power over longer periods and tolerate repeated discharges and recharges. Common sizes on this page include 12 Volt group 27DC for house loads, trolling motors, and accessories.
• Marine starting: Built to provide short, strong bursts of current to crank an engine, typically rated in MCA.

Choose deep cycle for powering onboard electronics and trolling motors, and a starting battery for engine cranking. Some setups use both (separate banks). Match group size, terminal type, and capacity to your equipment, and follow your boat or RV manufacturer’s recommendations.

Whether it’s for a car, lawn and garden equipment, or a powersport vehicle, a little care can help extend battery life during downtime.

• Fully charge the 12 Volt battery before storage and maintain it with a compatible smart charger or maintainer as recommended by the manufacturer.
• Store in a cool, dry, well‑ventilated area; avoid extreme heat.
• Keep terminals clean and dry; lightly protect them from corrosion as directed by your battery’s instructions.
• If removing the battery, carry it upright and avoid sparks. Wear eye protection and follow your owner’s manual for safe handling.

Reinstall carefully, ensuring secure connections. If you’re unsure about any step, a qualified technician can assist.