Yuasa YTX9-BS Motorcycle AGM Battery YUAM329BS — 135 CCA, Maintenance-Free, Dry-Ship Acid Pack

The Yuasa YUAM329BS (YTX9-BS) is a maintenance-free AGM motorcycle battery supplied dry with an acid pack, built for reliable starting power and spill-resistant, low-maintenance use.

Designed for motorcycles, ATVs and small powersport machines, the YTX9-BS combines absorbed glass mat (AGM) construction with advanced lead-calcium plates to deliver stable voltage, longer shelf life, and a valve-regulated, nonspillable design. It ships dry with the electrolyte in a separate bottle so you activate the battery when you’re ready, making it ideal for seasonal storage and long-term readiness.

How does the bottle-supplied (BS) format affect setup and storage?

Shipping the battery dry allows safe transport and longer shelf life before activation. You fill the battery with the included acid pack only when you intend to use it, which reduces the risk of self-discharge during extended storage and simplifies compliance with shipping rules.

• Comes with an electrolyte bottle for on-demand activation.
• Dry shipment reduces corrosion and self-discharge before first use.
• Recommended to charge soon after filling to ensure full capacity.

What performance can I expect from the YTX9-BS in cold weather?

This model offers 135 CCA (Cold Cranking Amps) at 0 °F (-18 °C), which gives dependable starting performance in lower temperatures for small engines. The AGM construction and lead-calcium technology help preserve charge and deliver consistent starts even after short storage periods.

• 135 CCA rating for reliable cold starts on motorcycles and scooters.
• AGM separators prevent electrolyte loss and maintain performance.
• Lead-calcium plates retain specific gravity longer than older lead-antimony types.

How do I maintain and charge this battery correctly?

The YTX9-BS is maintenance-free after activation — there’s no watering — but it does need periodic charging if left idle. Use a charger suited for AGM batteries and keep charging current within the manufacturer’s recommended range to maximize life.

• Regular charge current: approximately 0.9 A; use an AGM-compatible charger.
• Do not add water; valve-regulated design eliminates refilling.
• Top up charge every few months during long storage to prevent deep discharge.

What are the physical and electrical specs I should check before buying?

The YTX9-BS has compact dimensions and a light weight, making it suitable for many bikes and small vehicles where space is limited. Confirm terminal layout and size compatibility with your vehicle before purchase to ensure a proper fit.

• Dimensions: 6.0 in (150 mm) L × 3 7/16 in (87 mm) W × 4 3/16 in (105 mm) H.
• Weight with acid: 6.6 lbs; capacity: 8 Ah @ 10HR rating.
• Charging and starting specs: 0.9 A regular charge current; 135 CCA.

Who is this for: The Yuasa YUAM329BS (YTX9-BS) suits riders, powersports enthusiasts, and mechanics who need a compact, reliable, and spill-resistant battery that can be stored long-term before activation. It’s a good match for motorcycles, scooters, ATVs and other small-engine vehicles that require a 9-series AGM battery with strong starting power and minimal upkeep.