Yuasa YTX20L-BS Maintenance Free AGM 12 Volt Battery (Bottle Supplied) - YUAM320BS

The Yuasa YTX20L-BS Maintenance Free AGM Battery (YUAM320BS) is a 12-volt, absorbed glass mat motorcycle battery designed for riders who want a reliable, low-fuss power source for their Harley-Davidson and other powersports applications. Built on Yuasa's advanced lead-calcium AGM technology, this battery ships with an Acid Pak (bottle supplied) so you can activate and install it yourself — no separate acid purchase required. Whether you're replacing a worn-out OEM battery or upgrading to a more dependable unit, the YTX20L-BS delivers spill-proof, sealed performance that earns its reputation as a true "install it and forget it" battery.

Key Features & Benefits

• Maintenance-Free AGM Design: The special absorbed-glass mat construction eliminates water loss and allows the battery to be permanently sealed once filled with acid — no need to ever top off with water, saving you time and hassle over the battery's life.
• Advanced Lead-Calcium Technology: Yuasa's lead-calcium plate formulation reduces self-discharge and improves charge retention compared to conventional flooded batteries, so the battery holds its charge longer during storage or infrequent riding seasons.
• 270 Cold Cranking Amps (CCA): With 270 CCA, this battery provides strong, confident starting power even in cooler temperatures — critical for larger-displacement motorcycles and touring bikes that demand more from their electrical system.
• 18Ah Capacity (10-HR Rate): An 18 amp-hour capacity rating means ample reserve energy to support accessories, lighting, and electronics common on modern Harley-Davidson and powersports builds.
• Spill-Proof & Sealed Construction: Once activated and sealed, the AGM design is completely spill-proof, making it safe to mount in a variety of orientations and ideal for bikes where battery box placement isn't perfectly upright.
• Acid Pak (Bottle) Included: The electrolyte pack is included in the box, so activation is straightforward — just fill, seal, and charge before initial installation. No hunting for a separate acid supply.
• Periodic Charging Recommended During Storage: Like all AGM batteries, the YTX20L-BS benefits from a maintenance charge when the vehicle is stored for extended periods, helping to maximize service life.

Specifications

• Part Number: YUAM320BS
• Battery Type: YTX20L-BS
• Battery Family: Fresh Pack / Maintenance Free AGM
• Voltage: 12V
• Capacity (10-HR Rate): 18Ah
• Cold Cranking Amps (CCA): 270
• Dimensions: 6 7⁄8 in. × 3 7⁄16 in. × 6 1⁄8 in.
• Weight: 11.2 lb
• Electrolyte: Acid Pak (bottle) supplied — Fresh Pack activation required before first use

Fitment

The Yuasa YTX20L-BS is a widely-used battery size in the powersports industry, commonly specified for Harley-Davidson motorcycles across a broad range of models and years, as well as other motorcycles, ATVs, and powersports vehicles that call for a YTX20L-BS group-size battery. Because specific year/model fitment varies, we strongly encourage you to cross-reference your owner's manual or contact our team at ThreePiece.us to confirm compatibility with your exact vehicle before ordering. The YTX20L-BS designation is an industry-standard battery size, so if your vehicle's existing battery carries that code, the Yuasa YUAM320BS is a direct replacement.

What's in the Box

• 1× Yuasa YTX20L-BS AGM Battery (dry/Fresh Pack)
• 1× Acid Pak electrolyte bottle for activation

Note: This is a Fresh Pack battery. The battery must be filled with the included acid bottle and charged before installation. It is not pre-activated at the factory.

Why Buy from ThreePiece.us

At ThreePiece.us, we stand behind every product we carry with real expertise and genuine customer support. When you order the Yuasa YTX20L-BS from us, you get free shipping on every order — no minimums, no surprises at checkout. Need to spread out the cost? We offer financing through Affirm, letting you choose a payment plan that fits your budget. Have a fitment question before you buy? Our team is here to help you confirm compatibility and get you the right battery the first time.

Frequently Asked Questions

Q: Is this battery ready to install right out of the box?
A: Not immediately — the YUAM320BS ships as a Fresh Pack (dry-charged) battery. You'll need to fill it with the included Acid Pak electrolyte bottle, seal it permanently, and then charge it with an appropriate battery charger before installing it in your vehicle. This is a standard process for Fresh Pack AGM batteries and ensures the longest possible service life.

Q: Do I need to add water or check electrolyte levels during use?
A: No. Once filled and sealed, the absorbed-glass mat design eliminates water loss and the battery is permanently sealed. No water additions or electrolyte checks are needed during normal service life — though periodic maintenance charging is recommended when the bike is stored for extended periods.

Q: How do I know if the YTX20L-BS fits my motorcycle?
A: The easiest way is to check the battery type designation printed on your current battery or listed in your owner's manual. If it calls for a YTX20L-BS, the Yuasa YUAM320BS is a direct-fit replacement. If you're unsure, reach out to our team at ThreePiece.us and we'll help you confirm fitment before you order.

Q: Is periodic charging really necessary when the bike is stored?
A: Yes. Like all AGM batteries, the YTX20L-BS will slowly self-discharge over time even when not in use. Connecting a quality battery maintainer or trickle charger during long storage periods helps prevent deep discharge, which can permanently reduce capacity and shorten the battery's overall lifespan.