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Provide dependable cranking power and long-lasting durability for high-displacement v-twin motorcycles, performance side-by-sides, and utility vehicles. The Yuasa YTX20L Maintenance Free AGM 12-Volt Battery is a factory-activated, high-performance AGM starter module designed to resist heat, vibration, and sulfation [MPN: YUAM420BS]. Pre-filled, permanently sealed, and fully charged directly from the manufacturer, its Absorbed Glass Mat (AGM) internal structure immobilizes electrolyte within micro-fiber glass separators, delivering a completely leak-proof and maintenance-free power cell.
This heavy-duty AGM battery conforms to standard BCI YTX20L casing dimensions (175 mm x 87 mm x 155 mm / 6.875 in. x 3.44 in. x 6.125 in.), featuring a specialized "L-type" polarity configuration with Negative on the Left and Positive on the Right. Built with robust lead-calcium grid alloy and a high-impact polypropylene case, the cell construction provides low self-discharge during off-season storage and low internal resistance for fast cranking power. Heavy-duty cast terminals maintain maximum connectivity under high vibration. Keep vehicle charging system output between 13.8V and 14.8V, using an automatic smart maintainer during extended idle periods to preserve battery life.
This factory-activated YTX20L unit drops directly into OEM battery cradles designed for a 175 mm x 87 mm x 155 mm footprint with Right-Hand Positive polarity layout. It acts as an exact replacement or upgrade for conventional YTX20L, YTX20L-BS, GTX20L-BS, and FTX20L-BS batteries across motorcycles, side-by-sides, ATVs, snowmobiles, and personal watercraft requiring high initial CCA ratings in a medium-large casing format.
CRITICAL INSTALLATION AND SAFETY NOTES: This high-performance AGM battery is factory activated, fully charged, and permanently sealed at the manufacturer—never attempt to puncture, open, or add liquid to the casing. Always disconnect the negative (-) ground cable first during battery removal and reconnect the negative (-) ground cable last during installation to prevent chassis arcs and short circuits. Verify terminal fastener torque during routine servicing.
| Field | Value |
| Brand | Yuasa Batteries |
| Model Series | Factory Activated Maintenance Free AGM |
| Part Number / Designation | YTX20L (YUAM420BS / YTX20L-BS) |
| Battery Technology Type | Absorbed Glass Mat (AGM) Factory Sealed |
| Cold Cranking Amps Rating | 270 CCA |
| Capacity Amp Hours Profile | 18 Ah (10 HR Rating) / 18.9 Ah (20 HR Rating) |
| Nominal Circuit Voltage | 12V Nominal |
| Terminal Polarization Layout | Negative (-) Left / Positive (+) Right |
| Maintenance Requirement | 100% Maintenance-Free / Factory Sealed |
| Primary Vehicle Fitment Segment | V-Twin Motorcycles, UTV Side-by-Sides, ATVs, Snowmobiles, PWC |
| Product Dimensions | 6.875 x 3.44 x 6.125 inches — 175 x 87 x 155 mm |
| Product Total Weight | 14.7 lbs — 6.7 kg |
Not every product runs through our fitment finder, and we would rather you confirm exact fitment than rely on a partial filter. Match the specifications against your machine or the part you are replacing, or contact us and we will confirm it for you.
Ask a Parts Specialist →| Brand | Yuasa Battery |
|---|---|
| SKU: | YUAM420BS |
| MPN | YUAM420BS |
| UPC: | 48493420219 |
| Condition: | New |
| air_freight_prohibited | false |
| not_carb_approved | false |
| ltl_freight_required | false |
| prop_65 | Unknown |
| part_type | powersports |
| epa | N/A |
| carb_acknowledgement_required | false |
| regular_stock | t |
| units_per_sku | 1 |
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