Mighty Max Battery YTX20L-BS 12V 18Ah Motorcycle Battery — 270 CCA, AGM Sealed Maintenance-Free

The Mighty Max Battery YTX20L-BS is a sealed 12V 18Ah AGM rechargeable motorcycle battery delivering 270 CCA in a compact, maintenance-free package ready to install.

This YTX20L-BS model uses absorbed glass mat (AGM) lead-acid technology to deliver dependable starting power and steady electrical output for motorcycles, ATVs, personal watercraft, snowmobiles and similar powersports machines. The battery is shipped sealed and pre-charged, so it arrives ready for immediate installation. Its vibration-resistant construction and ability to be mounted in various orientations make it a flexible choice for tight engine bays and performance applications.

How will this battery perform in cold starts?

The YTX20L-BS provides 270 cold cranking amps, which helps ensure reliable engine starts in cooler temperatures. Its AGM design supports strong initial current delivery and recovers quickly after repeated starting cycles.

• 270 CCA rating for robust cold-start capability
• AGM plates designed for rapid current delivery
• Stable voltage under starter loads to reduce misfires

Can I mount this battery in different positions?

Yes — the sealed AGM construction allows the battery to be installed in various orientations without leaking. That flexibility helps when space is limited or when framing a custom battery tray.

• Sealed design — safe in tilted or vertical mounts
• Leak-resistant construction for closed compartments
• Shock and vibration resistance for off-road use

What are the physical size and terminal layout details?

The YTX20L-BS has compact dimensions to fit many common powersports applications. Terminal polarity is negative on the left and positive on the right when the terminals are closest to you, and the product ships with mounting screws included.

• Dimensions: 6.88" x 3.50" x 6.13" — fits standard YTX20L-BS compartments
• Polarity: negative terminal on the left, positive on the right
• Includes battery and screws; harnesses or straps sold separately

How does maintenance-free AGM benefit everyday riders?

AGM batteries are sealed and do not require periodic watering, reducing upkeep while maintaining reliable charge retention. They tolerate frequent engine cycles and can be recharged easily with common chargers designed for sealed lead-acid batteries.

• No need for electrolyte checks or topping up
• Ready-to-install out of the box — pre-charged at shipment
• Works with standard SLA/AGM chargers for easy recharging

Who is this for: Riders and owners of motorcycles, ATVs, personal watercraft, jet skis, and snowmobiles who need a compact, rugged, maintenance-free battery with solid cold-start power. It’s also a good choice for hobbyists and small vehicle builders seeking a vibration-resistant, mount-anywhere power source with a one-year warranty for peace of mind.