Welcome to our store. Your trusted source for batteries and power solutions. Learn more

For support or quotes: sales@batteryweb.com

WELCOME5
SigmasTek  |  SKU: BW-17289

STX20L-BS High Performance Replacement Battery for Yamaha YFM660FW Grizzly ATV (1998-2006) 11.62 lb

18% off
Sale price $75.99 USD Regular price $92.99
Shipping calculated at checkout.
Direct replacement for Yamaha YFM660FW Grizzly (1998-2006)
Meets or exceeds OEM specs for reliable starting power
Factory activated and ready for immediate installation
Durable, spill-proof, and maintenance-free design
Provides consistent 12V and 18Ah power for tough off-road use
In stock

— Ready to ship immediately

Free shipping

Visa Mastercard American Express PayPal Apple Pay Google Pay Shop Pay Discover Klarna Afterpay Stripe

Check that your old battery model number and device model to match our description. This makes sure they work together.


We ship your order same day if you buy it before 4 PM EST.

Send Your Battery Photo

Expert Technician Help

Snap a photo or video of your battery and send it to us. We'll identify the exact replacement—fast and hassle-free. Our team has helped thousands of customers find the right battery quickly and easily.

POST YOUR BATTERY IMAGE
Product & Solutions Expert

Product & Solutions Expert

✉ sales@batteryweb.com

🔹 10+ Years Battery Experience 🔹 Fast & Accurate Identification

Battery Care Tips

🔹 Getting Started

Charge your new battery fully before you use it for the first time. Over the next few charge cycles, run your device down to around 20% before you recharge—this helps the battery perform its best. After that, charge whenever you need to.

🔹 Keep It Healthy

Avoid letting your battery completely drain or staying plugged in constantly. Both extremes wear it out faster. Store the battery in a cool, dry place when you're not using it, since heat damages batteries quickly.

Delivery and Shipping

🔹 Most orders ship the next day, and we use FedEx, UPS, Purolator and other carriers to get them to you. Lithium batteries have to ship by ground only, not air or USPS. Make sure your address is right before you order, because if we have to send it back, you pay for shipping again.

Disclaimer

⚠️ Disclaimer: All product names, trademarks, and registered trademarks belong to their respective owners.

🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.


Volts & Amps

12 Volts | 18 Ah

Terminal Type

Nut & Bolt

STX20L-BS Replacement Battery — Yamaha YFM660FW Grizzly (1998-2006)

Upgrade your Yamaha YFM660FW Grizzly (1998-2006) with the STX20L-BS replacement battery engineered for reliable starting power and dependable off-road performance. This high-quality, high-performance battery is designed to provide a perfect fit and consistent power delivery for your ATV, combining factory activation with a maintenance-free, spill-proof design for maximum convenience and reliability in rugged conditions.

Key Specifications

  • Product: STX20L-BS
  • Compatible Model: Yamaha YFM660FW Grizzly (1998-2006)
  • Brand: SigmasTek
  • Voltage: 12 Volts
  • Capacity: 18 Ah
  • Terminal Type: Nut & Bolt
  • Factory activated and ready to install
  • Meets or exceeds OEM specifications
  • Spill-proof and maintenance-free design
  • Durable construction for demanding ATV applications
  • Direct replacement for Yamaha YFM660FW Grizzly

Benefits

The STX20L-BS offers long-lasting battery life and exceptional reliability under the stresses of trail riding and heavy use. Built with a durable construction that resists vibration and impact, this battery is a top choice for riders who need consistent starting power in all conditions. As a maintenance-free and spill-proof unit, it reduces upkeep and eliminates the mess associated with traditional batteries, making it simple to install and maintain.

This high-performance battery delivers dependable cold-cranking ability and consistent voltage output, ensuring fast starts and reliable electrical performance for lights, winches, and accessories. It meets or exceeds OEM specifications for fit and function, so you get a true direct replacement that retains factory-level reliability. Whether you use your Grizzly for work, recreation, or utility tasks, this STX20L-BS battery provides the robust power reserve you need.

Beyond ATV use, this long-lasting battery is suitable for related applications that require stable 12V power and a compact footprint. It is a solid option for backup power, small equipment, and any application requiring a sealed, maintenance-free battery.

Choose the STX20L-BS replacement battery for proven performance and confidence on every ride. Order now to restore reliable starting power to your Yamaha YFM660FW Grizzly and enjoy hassle-free installation and durable performance.

Technical Specifications

Voltage12 Volts
Amp Hours18 Ah
Terminal TypeNut & Bolt
Cold Cranking Amps (CCA)270
Length (in.)6.89
Width (in.)3.43
Height (in.)6.14
Weight (lb.)11.61

Product Highlights

  • Manufacturer: SigmasTek
  • Product Type: Powersport Batteries
  • Warranty: 6 Months
  • Bulk Orders: sales@batteryweb.com

Connections & Interface

  • Polarity: "'-/+"

Payment & Security

Payment methods

  • American Express
  • Apple Pay
  • Bancontact
  • Diners Club
  • Discover
  • Google Pay
  • Mastercard
  • PayPal
  • Shop Pay
  • Visa

Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.