Yuasa YTX9-BS Maintenance Free AGM 12-Volt Battery w/Bottle

Yuasa YTX9-BS Maintenance Free AGM Battery Yuasa has been making motorcycle batteries longer than most brands in this space have existed. The YTX9-BS is one of their most widely used sizes — a direct-fit replacement for a huge range of motorcycles, ATVs, scooters, and powersports vehicles that run a YTX9-BS battery from the factory.This isn't a budget option trying to compete on price. Yuasa is the largest motorcycle battery manufacturer in the world, and over 50 years of engineering experience goes into every battery they build. The YTX9-BS reflects that — solid construction, reliable starting, and a maintenance-free design that works the way a motorcycle battery should.Key SpecsVoltage: 12VCold Cranking Amps: 135 CCAAmp Hour Capacity: 8Ah (at 10 hours)Length: 6.00 inchesWidth: 3.437 inchesHeight: 4.187 inchesWeight: 6.6 lbsTechnology: AGM (Absorbed Glass Mat)Includes: Pre-measured acid bottleWhat AGM Actually Means A lot of batteries get labeled "maintenance free" without really earning it. Yuasa's AGM technology earns it.Absorbed Glass Mat separators are an advanced battery technology that eliminates the need to ever add water. The advanced lead-calcium alloy holds its specific gravity more than three times longer than conventional lead antimony batteries — meaning it can go much longer between charges when sitting in standby mode, like winter storage.The spill-proof design means there is virtually no possibility of leaks, making it safe to mount in any position without worrying about acid getting where it shouldn't.For most riders this translates to one thing — you install it and you stop thinking about it. No checking fluid levels. No adding distilled water. No worrying about acid damage if the bike sits on its side. It just works.Compatibility The YTX9-BS is one of the most common powersports battery sizes on the market. It fits hundreds of motorcycles, ATVs, scooters, and powersports vehicles across Honda, Yamaha, Kawasaki, Suzuki, and many other manufacturers.Confirm fitment by checking your current battery — the size designation is printed on the label. If it reads YTX9-BS, this is a direct drop-in replacement. The dimensions are 6" x 3.437" x 3.437" — confirm these match your battery tray before ordering if you're replacing a different size.Install Insight Fill the battery with the included acid bottle, let it absorb for at least 30 minutes, then charge fully before installing. Do not rush the initial charge — starting your bike on a battery that hasn't completed its first charge shortens its service life.Use a smart charger or a charger with an AGM-compatible mode. A constant-current charger left unattended can overcharge and damage the battery. If your bike will sit for more than a month, connect a battery tender to keep the charge topped up — even AGM batteries will sulfate if left completely discharged for extended periods.Who This Is For Anyone replacing a dead or aging YTX9-BS battery who wants a quality OEM-equivalent replacement without overpaying. Yuasa is the brand many motorcycle manufacturers spec from the factory — the YTX9-BS meets or exceeds OEM specifications.It's also the right call for riders who store their bikes seasonally. AGM batteries hold voltage longer and need less charging in standby mode compared to conventional flooded batteries — which means you're less likely to come back to a dead battery after winter storage than you would be with a standard lead-acid unit.Key BenefitsAGM technology — No water to add, no acid levels to check, no maintenance beyond keeping it charged. Fill it once and forget it.Lead-calcium alloy construction — Holds specific gravity more than three times longer than conventional lead antimony batteries. Stays ready longer between charges during storage.Spill-proof sealed design — Passed vibration and pressure differential spill-proof tests. No acid leaks regardless of mounting position.135 CCA — Reliable cold weather starting for the engines this battery is sized for. Consistent cranking power from a cold start.Dry charged with included acid bottle — Ships fresh with maximum shelf life. Fill and charge before first use.Yuasa quality — The largest motorcycle battery manufacturer in the world. Trusted by OEM manufacturers and riders for over 50 years.FAQsDoes this battery come ready to use?No — it ships dry charged with a separate acid bottle included. You need to fill it with the included acid, let it absorb, then charge it fully before installing. This is standard for this type of battery and ensures it arrives fresh rather than sitting pre-filled on a shelf. What charger should I use?Use a smart charger or a charger with an AGM-compatible mode. Avoid cheap constant-current chargers that don't automatically shut off — overcharging damages AGM batteries. A quality battery tender or smart charger is worth the investment and will extend the life of this battery significantly.How long will it last in winter storage? Longer than a conventional flooded battery. The lead-calcium construction holds its charge much longer in standby mode. That said, even AGM batteries benefit from a battery tender during extended storage. If the bike sits for the whole winter, connect a tender — don't just assume it'll be fine in spring.Is this battery truly maintenance free? Once it's filled and sealed, yes. You never add water, check acid levels, or open it again. The only maintenance it needs is keeping it charged when the bike isn't being ridden regularly.Can I mount this battery in any position? The sealed spill-proof construction means acid won't leak in different orientations. Confirm your battery tray accommodates the dimensions and terminal positions before ordering — the physical mounting position depends on your bike's design, not the battery.What is the warranty? Yuasa backs the YTX9-BS with a 12-month warranty. Purchase from an authorized dealer like WyldPerformance.com to ensure your warranty is valid.