Mighty Max Battery YTX9-BS 12V 8Ah AGM Motorcycle & ATV Replacement — Sealed, Vibration‑Resistant

The Mighty Max Battery YTX9-BS is a sealed 12V, 8Ah AGM battery engineered to replace OEM units in select Honda ATVs and motorcycles while delivering dependable starts and durable vibration resistance.

This compact, maintenance-free YTX9-BS battery is designed for riders and mechanics who need a reliable, plug-and-play power source for off-road and street machines. Built as a sealed lead-acid (SLA/AGM) unit, it offers a high discharge capability, wide temperature tolerance, and a one-year warranty. The battery matches the physical dimensions and terminal orientation of common Honda fitments, making it a straightforward swap for models such as TRX300EX, TRX400EX, 300EX, 400EX and CBR900R / CBR900RR where the original battery specification calls for a 12V 8Ah YTX9-BS equivalent.

Will this battery fit my Honda ATV or motorcycle?

Check your OEM battery size, voltage, and terminal layout; the YTX9-BS is 12V and 8Ah with the positive terminal on the left and negative on the right when seated. It is a common replacement for the Honda models listed, but confirm dimensions and polarity before purchase.

• Dimensions: 5.90" x 3.38" x 4.25" (L x W x H)
• Voltage/Capacity: 12V, 8Ah
• Terminal orientation: positive-left, negative-right
• Replaces OEM batteries for TRX300EX, TRX400EX, 300EX, 400EX, CBR900R/RR where applicable

How does the YTX9-BS perform in rough riding conditions?

The sealed AGM construction resists vibration and shock, so the battery maintains performance on trails and uneven surfaces. Its design supports deep discharge recovery and consistent cranking power in a range of temperatures.

• AGM/SLA spill-proof design resists leaks and can be mounted in any orientation
• High discharge rate for reliable engine starts
• Durable in both high and low temperature environments
• Shock- and vibration-resistant build for off-road use

What installation and maintenance should I expect?

Installation is typically straightforward: remove the old battery, verify polarity and fit, then secure the YTX9-BS using your existing hold-downs and the included screws. No special fluids or filling are needed thanks to the sealed AGM design.

• Listing includes battery and screws; no harness or mounting accessories supplied
• Rechargeable and maintenance-free—no topping up with acid or water
• Can be mounted in any position for flexible installations
• Use a compatible charger for storage to preserve capacity and lifespan

What warranty and safety features come with this battery?

The YTX9-BS includes a full one-year warranty covering manufacturing defects under normal use. As a sealed battery it reduces the risk of spills and requires less user maintenance compared with wet-cell alternatives.

• One-year limited warranty from Mighty Max Battery
• Sealed AGM design minimizes leak and corrosion risks
• Complies with common safety expectations for SLA batteries when installed properly
• Follow vehicle manufacturer torque and wiring specs for safe installation

Who is this for: Riders, mechanics, and DIY vehicle owners seeking a compact, maintenance-free replacement battery for select Honda ATVs and sport bikes. It’s best for those who want a sealed AGM unit that tolerates vibration and temperature swings, matches OEM size and polarity, and offers straightforward installation without the need for additional fluids or complex maintenance routines.