The battery is the last thing most riders think about — right up until the moment it doesn't work. Dead battery on a cold morning, or worse, at the end of a long ride somewhere you don't want to be stuck. The Yuasa YTX12-BS is a straightforward fix for that problem.Yuasa supplies powersports batteries to more OEM manufacturers than all their competitors combined, both in the US and globally. The reason is simple — premium quality, unmatched reliability, long life, and advanced engineering backed by years of application expertise. The YTX12-BS is one of their most widely fitted sizes, used across hundreds of motorcycles, ATVs, scooters, and powersports vehicles from the factory. If your bike came with a YTX12-BS, this is the direct replacement.
Specification
Voltage: 12V
Cold Cranking Amps: 180
Capacity: 10Ah (10-hour rate)
Length: 6.00 inches
Width: 3.437 inches
Height: 5.125 inches
Weight: 9.2 lbs
Technology: AGM (Absorbed Glass Mat)
Comes with: Pre-measured acid bottle
Why AGM Makes a Difference
Absorbed Glass Mat separators are an advanced battery technology that eliminates the need to ever add water. Advanced lead-calcium technology holds specific gravity more than three times longer than conventional lead antimony batteries — meaning much longer periods between charges when the battery sits in standby, like during winter storage.AGM batteries also have less internal resistance, which allows them to produce more cold cranking amperage compared to conventional wet batteries of a similar size. They also recharge faster, offer better resistance to heat and vibration, and self-discharge at a much slower rate — around 3% per month compared to 15% for conventional batteries.That last point is the one most riders care about in practice. Leaving a bike sitting for a couple of months is a lot less stressful when the battery is designed to hold its charge that long. You come back in spring and the bike still starts.The polypropylene casing resists gas, oil, impact, and corrosion. The spill-proof sealed VRLA design prevents leaks — so no acid dripping into the tray, no corrosion building up on surrounding metal, no mess.
About the Acid Bottle
The YTX12-BS ships dry charged with a pre-measured acid pack included. The advantage of purchasing a dry charged unfilled battery is a much longer shelf life — the battery you receive is 100% fresh, not one that has been slowly losing capacity pre-filled on a shelf.Filling it is simple. Pour the included acid into the cells following the fill lines, let it sit and absorb for at least 30 minutes, then give it a full charge before installing. Always wear gloves and eye protection when handling the acid — it is hazardous and needs to be treated with care. Work outside or in a well-ventilated space.Once filled, place the seal strip across the top to create a fully sealed, spill-proof battery. From that point on it's maintenance free for the rest of its service life.
Compatibility
The YTX12-BS fits a wide range of motorcycles and powersports vehicles. Common fitments include bikes from Honda, Yamaha, Kawasaki, Suzuki, Aprilia, Triumph, BMW, and many others across multiple decades.Check the label on your current battery before ordering. If it says YTX12-BS, this drops straight in — same dimensions, same terminal positions, same fit. If you're unsure, confirm the dimensions (6" x 3.437" x 5.125") match your battery tray before purchasing.One important note for Triumph riders: carbureted models take the YTX12-BS, but EFI models require the YT-12B-BS due to the ECU system located in the battery tray which is 18mm narrower. Double check your specific model before ordering.
Installation
Fill the battery with the included acid, let it sit for at least 30 minutes to absorb properly, then charge fully before installing. Do not skip the full initial charge — putting the battery in service before it has completed its first charge shortens its overall service life. A few hours up front saves you from replacing it early.Use a smart charger or one with an AGM-compatible mode. A basic trickle charger without automatic shutoff can overcharge AGM cells and damage them over time. If the bike is going to sit for more than a month between rides, put a battery tender on it. Even a good AGM battery won't survive months of sitting completely discharged.
Who This Is For
Anyone replacing a dead or aging YTX12-BS who wants a quality OEM-equivalent without overpaying. Yuasa supplies more OEM manufacturers than any competitor — this is the battery a lot of bikes came with from the factory, and it meets or exceeds those original specs.It is also a smart choice for seasonal riders. The lead-calcium AGM construction holds its charge significantly longer than a conventional battery sitting in standby, which means less stress over winter storage and a better chance of the bike starting cleanly when spring finally arrives.
Key Benefits
True maintenance free — No water to add, no fluid levels to check, no opening it after the initial fill. AGM technology delivers on the promise.
180 cold cranking amps — More cranking power than conventional batteries of similar size, thanks to AGM's lower internal resistance. Reliable starts in cold weather and after extended storage.
Holds charge 3x longer in standby — Lead-calcium alloy holds specific gravity more than three times longer than conventional lead antimony batteries. Built for bikes that sit between seasons.
Spill-proof sealed design — Resistant to gas, oil, impact, and corrosion. No acid leaks regardless of mounting position.
Ships dry and fresh — Pre-measured acid bottle included. You activate it, not a warehouse shelf.
OEM trusted — The brand more manufacturers spec from the factory than any other. Consistent quality across every battery they build.
FAQs
Does it come ready to install?
No — it ships dry charged. Fill it with the included acid, let it absorb for 30 minutes, then charge fully before installing. This keeps the battery fresh and properly activated before it goes into service.
What charger should I use?
A smart charger or one with a dedicated AGM mode. Avoid basic constant-current chargers that don't automatically shut off — overcharging damages AGM cells. A quality battery tender works well for both initial charging and long-term storage maintenance.
How does it handle sitting over winter?
Better than a standard flooded battery by a significant margin. The self-discharge rate is around 3% per month compared to 15% for conventional batteries — so after a few months in the garage it still has something left. That said, a battery tender during extended storage is always the smarter move.
Is it truly maintenance free after filling?
Yes. Once filled and sealed, you never open it again. No water to add, no acid levels to check. Keep it reasonably charged when the bike sits and it takes care of itself.
Can it be mounted in different positions?
The sealed spill-proof design handles various orientations without leaking. Confirm the physical dimensions and terminal layout fit your specific battery tray before ordering.
What is the warranty?
Yuasa backs the YTX12-BS with a 12-month manufacturer warranty. Purchasing from an authorized dealer like WyldPerformance.com ensures your coverage is valid.
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