Mighty Max Battery YTX9-BS 12V 8Ah Motorcycle AGM Battery — 135 CCA, Maintenance-Free

The Mighty Max Battery YTX9-BS is a sealed 12-volt, 8 Ah AGM motorcycle battery delivering 135 CCA in a maintenance-free, ready-to-install package.

This compact rechargeable sealed lead-acid battery uses Absorbed Glass Mat (AGM) technology to combine spill-proof safety, reliable cold-start performance and resistance to vibration in a package sized for sport bikes, scooters, ATVs and powersports equipment. It ships fully charged and does not require adding electrolyte or routine watering. Built to tolerate a wide temperature range and repeated charge cycles, the YTX9-BS is a straightforward replacement or spare for riders who want plug-and-play power and a one-year warranty.

How does the YTX9-BS perform in cold starts and daily riding?

The YTX9-BS provides 135 Cold Cranking Amps (CCA), which improves starting reliability in cooler conditions compared with lower-CCA cells. Its AGM construction supports higher discharge rates, so it handles repeated engine starts and short-trip use better than standard flooded batteries. For regular commuting or weekend rides, it supplies consistent voltage for lights, ignition and accessories.

• 135 CCA for dependable ignition in cool weather
• AGM design supports higher discharge and faster recovery
• Stable voltage for lights, horns and electronic systems

Can this battery be mounted in tight or tilted spaces?

Yes — the YTX9-BS is sealed and spill-proof, so it can be installed in any orientation without leaking. Its compact dimensions (5.90" x 3.38" x 4.25") make it suitable for cramped battery compartments found on motorcycles, scooters and some ATVs. The construction also resists shocks and vibration typical of off-road or spirited street riding.

• Sealed AGM allows multi-position mounting safely
• Compact footprint fits small battery trays and cases
• Vibration-resistant casing helps extend usable life

What maintenance and charging does this battery require?

The YTX9-BS is maintenance-free: it comes fully charged and does not need water top-ups. For long storage, periodic recharge with a compatible motorcycle battery charger or a smart AGM charger is recommended to prevent deep discharge. Use a charger with an AGM or SLA setting to ensure proper charging profile and avoid overcharging.

• Ships charged and maintenance-free—no watering
• Use a smart charger with AGM/SLA setting for long storage
• Recommended recharge intervals during long-term storage to preserve capacity

What are the dimensions, polarity and included parts?

The battery measures 5.90 inches long, 3.38 inches wide and 4.25 inches tall, with positive terminal on the left and negative on the right when viewed from the front. This listing includes the battery and mounting screws only; wire harnesses, connectors or mounting brackets are not supplied. Confirm fit and terminal orientation for your vehicle prior to purchase.

• Dimensions: 5.90" x 3.38" x 4.25" for compact fit
• Polarity: positive terminal on left, negative on right
• Included: battery and screws; no harnesses or brackets

Who this battery is for: Riders, powersports owners and DIY mechanics who need a compact, maintenance-free replacement battery with reliable cold-cranking power and the convenience of AGM construction. It's well suited to motorcycles, scooters, ATVs, personal watercraft and small vehicles that require a 12V 8Ah sealed battery with predictable performance, resistance to vibration and easy installation. If you need a straightforward, rechargeable battery that can be mounted in tight spaces and will handle frequent starts, the Mighty Max YTX9-BS is a practical choice backed by a one-year warranty.