BikeMaster BTX20L-BS Battery - 781314

The BikeMaster BTX20L-BS Battery (Part #781314) is a maintenance-free replacement motorcycle battery designed to deliver reliable starting power for compatible powersports applications. As a sealed, spill-proof unit that comes ready to activate, the BTX20L-BS is a popular choice among riders looking for a dependable, low-hassle battery replacement that eliminates the guesswork of conventional wet-cell maintenance.

Key Features & Benefits

• Maintenance-Free Design: Once activated, this battery never needs refilling — no topping off with distilled water, no acid level checks. You spend less time in the garage and more time on the road.
• Sealed, Spill-Proof Construction: Includes a seal that places across the top of the battery after activation, creating a fully sealed unit. This makes it safe to install in any orientation supported by your bike's battery tray and eliminates concerns about acid leaks during riding.
• Pre-Measured Acid Tubes Included: Comes with pre-measured acid tubes so activation is straightforward — simply empty the tubes into the battery, seal it, and charge before first use. No measuring, no mess.
• One-Year Manufacturer's Warranty: BikeMaster backs this battery with a one-year warranty, giving you confidence in the product's quality and longevity.
• Periodic Charging Recommended During Storage: Once activated, the battery may require charging during prolonged storage periods — a standard best practice for any lead-acid battery that helps extend service life over the winter or off-season.
• Drop-In Fitment: Engineered to the BTX20L-BS industry-standard form factor, making it a direct replacement for bikes that call for this battery size without modification.

Specifications

• Brand: BikeMaster
• Part Number / MPN: 781314
• SKU: BKM781314
• UPC: 887337004822
• Battery Designation: BTX20L-BS
• Battery Type: Maintenance-Free (sealed, spill-proof)
• Warranty: One year (manufacturer)

Fitment

The BTX20L-BS is an industry-standard motorcycle battery designation, and this BikeMaster unit is built to fit any powersports application that specifies a BTX20L-BS battery. One confirmed example from retailer listings includes the 1997 Big Dog Aeroglide. Because fitment spans a wide range of motorcycles, ATVs, and powersports vehicles that use the BTX20L-BS size, we strongly recommend verifying compatibility with your specific year, make, and model before ordering.

If you're unsure whether the BikeMaster BTX20L-BS Battery is the right fit for your bike, the ThreePiece.us team offers expert fitment support — contact us before you buy to confirm compatibility.

What's in the Box

• 1x BikeMaster BTX20L-BS Battery
• Pre-measured acid tubes (for activation)
• Top seal (to create a sealed, spill-proof battery after filling)

Why Buy from ThreePiece.us

• Free Shipping: Every order ships free — no minimum purchase required and no hidden freight charges at checkout.
• Affirm Financing: Break your purchase into manageable payments with Affirm financing, available at checkout. Get the parts you need now and pay over time.
• Expert Fitment Support: Not sure if this is the right battery for your application? Our knowledgeable team has helped over 10,000 customers find the right parts. Reach us by phone at 813-535-5801 or by email before you order.
• In-Stock Availability: The BikeMaster BTX20L-BS Battery is a regularly stocked product at ThreePiece.us, so you're not waiting weeks for a back-ordered part.
• Price Match Guarantee: Found it cheaper elsewhere? ThreePiece.us offers a price match guarantee on all products.

Frequently Asked Questions

Q: Does this battery arrive ready to use, or does it need to be activated first?
A: The BikeMaster BTX20L-BS Battery requires activation before use. It comes with pre-measured acid tubes — you empty the tubes into the battery, apply the included seal to make it spill-proof, and then charge it fully before installing it on your bike. This is standard procedure for this battery type.

Q: Do I need to add water or maintain the electrolyte level over time?
A: No. Once activated, this is a maintenance-free battery — it never needs to be refilled. However, BikeMaster does recommend charging it periodically if the bike will sit unused for an extended period, such as during winter storage.

Q: What vehicles does the BTX20L-BS fit?
A: The BTX20L-BS is an industry-standard designation that fits a range of motorcycles and powersports vehicles specifying that battery size. If you have any doubt about fitment for your specific year, make, and model, contact our team at ThreePiece.us before ordering — we're happy to help confirm compatibility.

Q: What is the warranty on this battery?
A: BikeMaster provides a one-year manufacturer's warranty on the BTX20L-BS Battery (Part #781314).