Yuasa YTX9-BS AGM Motorcycle Battery YUAM329BS — 8Ah, 135 CCA, maintenance-free dry-pack

Built with absorbed glass mat (AGM) technology and lead-calcium plates, this Yuasa battery delivers reliable starting power in a small, service-friendly package. It ships dry in bottle-supplied form so you fill it when you're ready to install, avoiding storage-related degradation. The valve-regulated design prevents spills and eliminates routine water top-ups, while its cold cranking amperage and 10-hour amp-hour rating suit many motorcycles, ATVs, and personal watercraft.

How does this battery perform when the vehicle is stored for long periods?

The lead-calcium alloy and AGM construction reduce self-discharge compared with older lead-antimony designs, so it retains charge longer in storage. Nonetheless, periodic charging is recommended to preserve capacity and extend service life. A trickle or float charger specified for AGM batteries will keep it healthy without overcharging.

• Low self-discharge thanks to advanced lead-calcium chemistry
• AGM separators make the battery non-spillable for safe storage
• Recommended: occasional float charging during extended storage

What makes the bottle-supplied (BS) version useful for riders?

Bottle-supplied batteries come dry with electrolyte contained separately; you activate the cell only when you're ready to install. This prevents acid-related shipping restrictions, lengthens shelf life, and lets you transport the battery without liquid until final setup. Activation is a straightforward process that readies the battery within minutes.

• Shipped dry to avoid acid leaks and shipping complications
• Longer shelf life before activation compared with prefilled units
• Simple fill-and-wait activation process—no specialized tools needed

Will this battery fit my bike and deliver enough cranking power?

The YUAM329BS's compact dimensions (150 mm × 87 mm × 105 mm) and 6.6 lb weight make it compatible with many small motorcycles and scooters. It supplies 135 CCA at 0 °F (-18 °C) and an 8 Ah capacity at a 10-hour rate, which is adequate for a wide range of starter motors and accessory loads on lightweight machines. Always verify terminal orientation and physical fit before purchasing.

• Physical size: 6 in × 3 7/16 in × 4 3/16 in (150×87×105 mm)
• Capacity: 8 Ah (10-hour rate); Cold Cranking Amps: 135 CCA
• Weight with acid: approximately 6.6 lb—compact and lightweight

How should I charge and maintain this AGM battery for best life?

Use a charger compatible with AGM or sealed lead-acid batteries and avoid high-voltage bulk charging in unattended situations. Regularly topping up charge after rides and maintaining a float charge during storage will slow sulfation and preserve capacity. Avoid contaminants on terminals and ensure a secure, corrosion-free connection.

• Charge with an AGM/VRLA-compatible charger and follow manufacturer settings
• Top up charge after extended rides or long idle periods to prevent discharge
• Keep terminals clean and tightened to avoid voltage drops and corrosion

Who is this for: Riders, small-vehicle owners, and powersport enthusiasts who want a compact, spill-resistant battery that ships dry for flexible activation. It’s ideal for seasonal vehicles, project bikes, or anyone who prefers a maintenance-free AGM with reliable cold-start capability in a small form factor. Check fit and terminal orientation to ensure compatibility with your machine before purchase.