10 Best Batteries for Yamaha Rhino 660 Reviews

You know that sinking feeling when you turn the key on your Yamaha Rhino 660 and nothing happens—just a click or a slow groan. Whether you’re heading out for a trail ride, hauling gear around the property, or working on a weekend project, a dead battery can stop you cold. The stock battery in these machines often struggles after a few seasons, especially if you’ve added lights, a winch, or other accessories that draw extra power.

In this guide, we’ve rounded up the top battery options for the Yamaha Rhino 660 (and a couple of must-have accessories to protect your investment). You’ll learn about AGM and SLA technologies, which cold cranking amps you really need, and how to match a battery to your riding style. By the end, you’ll be able to pick the perfect power source with confidence.

Caltric AGM Battery – Versatile Power for Rhino and More

The Caltric AGM battery is a solid choice if you want a maintenance-free drop-in replacement that also works with a wide range of other equipment. It’s compatible not only with your Yamaha Rhino 660 (2004-2007) but also with countless John Deere lawn tractors, Kawasaki models, and MTD machines. That means if you have a mower or utility vehicle sitting in the shed, this same battery can serve double duty. The AGM (absorbed glass mat) design holds the electrolyte between fiberglass mats, so you never need to check water levels or add distilled water—just install it and forget it.

The battery comes pre-charged and includes all necessary hardware for a straightforward swap. It’s a sealed unit, so you can mount it in any position without worrying about acid leaks. For the Rhino 660, this battery provides enough cranking power to start the engine reliably even after a few weeks of sitting. If you’re looking for a budget-friendly AGM that offers multi-vehicle compatibility, the Caltric is hard to beat.

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• Order Includes: 1x AGM Battery
• Compatible With John Deere: 102 105 107H 115 125 135 145 155C 175 180 185 190C, D100 D105 D110 D120 D125 D130 D140 D150 D155 D160 D170, E100 E110 E120 E130 E140 E150 E160 E170 E180, G110 GS25 GS30 GS45 GS75 GT242 GT262 GT275, L100 L105 L107 L108 L110 L110 L111 L118 L120 L130, SST15 SST16 SST18, X105 X106 X110 X115R X116R X125 X126 X130R X135R, Z225 Z315E Z320M Z320R Z325E Z365R Z375R, LX172 LX173 LX176 LX178 LX186 LX188, LTR155 LTR166 LTR180, LT150 LT155 LT170 LT180 LT190
• Part Numbers: Compatible With Yamaha: 11U-1LD00-00-00, 5UG-H2100-00-00, BTG-11U1L-D0-00 / Compatible With John Deere: TY23017, TY25878, TY25221 / Compatible With Kawasaki: 26012-0107 / Compatible With MTD: 9251707D, 9251707C, 7251737, 7251706A, 7251750A, 7251707B, 7251706
• AGM (absorbed glass mat) is a special design glass mat designed to wick the battery electrolyte between the battery plates. Maintenance free never needs water.
• We strongly suggest comparing the posted picture to the unit(s) that needs to be replaced.

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Mighty Max YTX20L-BS – High CCA for Cold-Weather Starts

When you ride in freezing conditions, you need a battery that can deliver serious cranking power. The Mighty Max YTX20L-BS packs 270 cold cranking amps (CCA) into a compact 12V 18Ah sealed lead-acid (SLA) AGM package. That extra CCA means your Rhino 660 will turn over quickly even when the temperature drops below zero. The dimensions (6.88 x 3.50 x 6.13 inches) match the OEM battery tray perfectly, so installation is a breeze—just connect the positive and negative terminals (negative on left, positive on right).

This battery is built to handle heavy electrical loads. If you’ve added a winch, LED light bar, or heated grips, the YTX20L-BS can keep up without voltage sag. It’s also weatherproof, meaning rain, snow, and mud won’t compromise its performance. The AGM technology makes it spill-proof and vibration-resistant, which is critical when you’re bouncing over rocks and ruts. For riders who demand maximum starting power in harsh conditions, this Mighty Max is a top contender.

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• YTX20L-BS is a 12V 18AH 270 Cold Cranking Amps (CCA) Sealed Lead Acid (SLA) Battery
• Dimensions: 6.88 inches x 3.50 inches x 6.13 inches. Polarity: Negative on left, Positive on right. Listing is for the Battery and Screws only. No wire harness or mounting accessories included.
• Weatherproof Reliability: In rain, snow, or heat, this battery powers through.
• Built for Performance: Handles heavy-duty electrical loads without breaking a sweat.
• Consistent Power Output: Handles demanding electrical loads without a hitch.
• Rechargeable battery that can be mounted in any position, resists shocks and vibration.
• Maintenance free and sealed design.
• Full One Year Warranty

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Mighty Max YTX14-BS – Compact and Reliable for Smaller Engines

Not every Rhino 660 needs a massive battery. If you mostly ride in moderate weather and keep your electrical load light, the Mighty Max YTX14-BS is a compact, affordable alternative. With 12V, 12Ah, and 200 CCA, it provides enough power to start the 660 engine reliably in most conditions. Its smaller footprint (6.00 x 3.44 x 5.75 inches) means it fits easily into the battery compartment, though you may need to adjust the hold-down bracket or add a spacer to prevent movement.

This battery uses SLA/AGM technology, so it’s spill-proof and can be mounted in any orientation. It also offers deep discharge recovery, meaning if you accidentally leave your lights on, the battery has a better chance of bouncing back. The YTX14-BS is a great budget-friendly option for riders who don’t push their battery to the limit. However, if you frequently ride in sub-freezing temperatures or run a winch, you’ll want a higher CCA model.

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• YTX14-BS is a 12V 12AH 200 Cold Cranking Amps (CCA) Sealed Lead Acid (SLA) Battery
• Dimensions: 6.00 inches x 3.44 inches x 5.75 inches. Polarity: Positive on left, Negative on right. Listing is for the Battery and Screws only. No wire harness or mounting accessories included.
• SLA / AGM spill proof battery has a characteristic of high discharge rate, wide operating temperatures, long service life and deep discharge recover.
• Rechargeable battery that can be mounted in any position, resists shocks and vibration. Long lasting high performance in high and low temperatures.
• Full One Year Warranty

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UpStart UB-YTX20L-BS – Factory Activated, Ready to Install

Nothing is more frustrating than buying a battery that requires you to fill it with acid and wait for it to charge before you can use it. The UpStart UB-YTX20L-BS eliminates that hassle—it comes factory activated and fully charged, so you can install it straight out of the box. This 12V, 18Ah sealed lead-acid battery is a direct replacement for your 2004 Yamaha Grizzly 660 (and many other models), but it also fits the Rhino 660 perfectly. The dimensions match the YTX20L-BS standard, and the polarity is correct for your machine (negative left, positive right).

Because it’s maintenance-free and leak-proof, you never have to worry about acid spills or corrosion on your battery terminals. The sealed design also prevents moisture from entering, which extends the battery’s life in humid or wet environments. UpStart is a reputable brand that focuses on hassle-free power solutions. If you want a battery that’s truly plug-and-play without any prep work, this is an excellent choice.

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• UB-YTX20L-BS Battery Replacement for 2004 Yamaha YFM660FP, FR, FH, FL Grizzly 660 CC ATV – Factory Activated, Maintenance Free, Motorcycle Battery – 12V, 18AH, UpStart Battery Brand
• Factory Activated, Maintenance Free, Sealed Lead Acid Battery
• Ready to install. No need to add acid. Leak free, sealed design prevents corrosion.
• Easy to set up and maintain. UpStart Battery brand.
• One Year Warranty, Voltage: 12V, Capacity: 18Ah

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Mighty Max YTX20L-BS – Weatherproof Reliability for All Seasons

This is the same YTX20L-BS model from Mighty Max, but it’s worth highlighting separately because of its weatherproof credentials. If you ride your Rhino 660 in rain, snow, or extreme heat, this battery is designed to power through. The sealed AGM construction keeps the electrolyte locked inside, so even if you submerge the battery in a mud hole (not recommended, but it happens), you won’t short out the cells. The 270 CCA rating ensures you have plenty of reserve for those cold morning starts when the engine is stiff.

Beyond weather resistance, this battery handles heavy-duty electrical loads without breaking a sweat. Whether you’re running a winch to pull a stuck buddy, powering a sound system for a campsite party, or using auxiliary lights to navigate trails at night, the YTX20L-BS delivers consistent voltage. The dimensions (6.88 x 3.50 x 6.13 inches) are a perfect fit for the Rhino 660 tray. If you want a battery that shrugs off the elements and keeps working, put this one on your shortlist.

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• YTX20L-BS is a 12V 18AH 270 Cold Cranking Amps (CCA) Sealed Lead Acid (SLA) Battery
• Dimensions: 6.88 inches x 3.50 inches x 6.13 inches. Polarity: Negative on left, Positive on right. Listing is for the Battery and Screws only. No wire harness or mounting accessories included.
• Weatherproof Reliability: In rain, snow, or heat, this battery powers through.
• Built for Performance: Handles heavy-duty electrical loads without breaking a sweat.
• Consistent Power Output: Handles demanding electrical loads without a hitch.
• Rechargeable battery that can be mounted in any position, resists shocks and vibration.
• Maintenance free and sealed design.
• Full One Year Warranty

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Mighty Max U1 35Ah – High Capacity for Utility Vehicles

If you use your Rhino 660 more like a utility vehicle—hauling heavy loads, plowing snow, or running a sprayer—you may need more reserve capacity than a standard motorcycle-style battery. The Mighty Max U1 35Ah battery is a larger SLA/AGM unit that provides 35 amp-hours of power, nearly double that of the YTX20L-BS. This means you can run accessories for longer periods without draining the battery. It’s UL certified, so you know it meets safety standards.

The dimensions (7.76 x 5.12 x 7.01 inches) are larger than the typical Rhino battery, so you’ll need to check if it fits your battery tray or if you can modify the hold-down. The U1 group size is common in lawn tractors and some UTVs, so with a little creativity, you can make it work. The trade-off is extra weight and a slightly higher upfront cost. But if you need maximum runtime for your winch or lighting, this battery delivers.

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• ML35-12 SLA is a 12V 35AH Sealed Lead Acid (SLA) rechargeable maintenance free battery – UL Certified
• Dimensions: 7.76 inches x 5.12 inches x 7.01 inches. Listing is for the Battery and Screws only. No wire harness or mounting accessories included.
• SLA / AGM spill proof battery has a characteristic of high discharge rate, wide operating temperatures, long service life and deep discharge recover.
• Rechargeable battery that can be mounted in any position, resists shocks and vibration. Long lasting high performance in high and low temperatures.
• Full One Year Warranty

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M MATI Battery Cover Box Lid – Protect Your Investment

Your battery is only as good as its protection. The M MATI battery cover box lid is a direct replacement for the OEM part on Yamaha Rhino 660 (2004-2007) and Rhino 450 (2006-2009). Made from high-strength, corrosion-resistant material, this lid keeps moisture, mud, and debris out of your battery compartment. If your original lid is cracked, missing, or warped, replacing it can prevent short circuits and extend battery life.

Installation is straightforward: just snap it into place and secure it with the existing screws. The lid matches factory specifications, so you won’t have any fitment issues. It’s an inexpensive way to protect your new battery investment. Even if your current lid is intact, having a spare on hand is smart—especially if you ride in harsh conditions. Don’t overlook this small but essential accessory.

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• Manufacturer Part# 5UG-H2129-10-00
• Fitment: Fit for Yamaha Rhino 660 YXR66F 2004-2007 (ALL Edition) ▶ Rhino 450 YXR45F 2006-2009
• Feature: The battery cover box lid is made of premium material, which is high-strength, corrosion-resistant and not easy to break for long-lasting performance. Manufacturer specification and easy to install on battery
• Package: Battery Cover Box Lid x1 in a fine box
• Service: Please check the fitment detail before you place an order. If there is any product problem within 1 year, please contact us to solve it for you. We provide product service

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ExpertPower YTX20L-BS – 275 CCA for Confident Starting

ExpertPower takes the standard YTX20L-BS formula and pushes the cold cranking amps to 275, giving you even more starting confidence in cold weather. This 12V, 20Ah sealed lead-acid AGM battery arrives fully charged and maintenance-free, so you can install it and go. The advanced AGM technology ensures spill-proof operation and excellent performance in extreme temperatures, whether you’re riding in the desert heat or mountain snow.

One standout feature is the 12-month coverage that ExpertPower offers—a sign of confidence in their product. The battery is built for long cyclic life and deep discharge recovery, meaning it can handle occasional drains without permanent damage. The dimensions (6.88 x 3.50 x 6.13 inches) are standard, so it fits your Rhino 660 without any modifications. If you want that extra 5 CCA over the Mighty Max version, this is a great alternative.

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• High Performance: Provides 275 cold cranking amps (CCA) for reliable starting power in all weather conditions, ensuring your motorcycle starts quickly in both high and low temperatures.
• Maintenance-Free: Arrives fully charged and ready to install, eliminating the need for ongoing maintenance, offering convenience and ease of use.
• Advanced AGM Technology: Features Absorbent Glass Mat (AGM) technology for efficient power output, spill-proof design, and better performance in extreme conditions.
• Durable & Long-Lasting: Built for long cyclic life, this battery can handle high discharge rates and offers deep discharge recovery, ensuring dependable performance over time.
• 12-Month Coverage: Backed by a 12-month coverage period, offering peace of mind with your purchase.

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Daakmax YTX14-BS – Wide Compatibility for ATVs and UTVs

The Daakmax YTX14-BS is a 12V, 12Ah AGM battery with 200 CCA, designed to fit a huge range of vehicles beyond just the Rhino 660. It’s compatible with Honda Fourtrax, Pioneer, Yamaha Grizzly 350, Kawasaki Brute Force, Suzuki Eiger, and many more. If you own multiple machines, this single battery could serve as a spare for all of them. The dimensions (5.9 x 3.42 x 5.7 inches) are slightly different from the standard YTX14-BS, but still fit most trays with the correct orientation (positive left, negative right).

The sealed AGM technology prevents leaks and corrosion, and the battery can be mounted in any position. It’s built to withstand shocks and vibrations, which is essential for off-road use. Daakmax recommends replacing the battery every two years for optimal performance. For the Rhino 660, this battery provides adequate starting power for moderate conditions. If you want a versatile, affordable battery that works across your fleet, the Daakmax is worth considering.

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• ✅ High Performance & Reliable: Daakmax YTX14-BS is a 12V 12Ah sealed AGM (Absorbed Glass Mat) battery offering 200 cold cranking amps (CCA). Designed to deliver superior starting power and reliable performance even in cold weather.
• ✅ Easy Installation & Replacement：Dimensions: 5.9 x 3.42 x 5.7in, with left positive (+) and right negative (-) terminals. Ideal for replacing worn-out batteries, with a recommended replacement cycle every two years for optimal performance.
• ✅ Widely Compatible:Compatible with popular ATV, motorcycle, and UTV models, including Honda Fourtrax, Honda Pioneer, Yamaha Grizzly 350, Kawasaki Brute Force, Suzuki Eiger, Yamaha Kodiak, and more. Also works for personal watercraft, jet skis, and snowmobiles. See the product description for more detailed fitment compatibility.
• ✅ Sealed AGM Technology: This AGM (Absorbent Glass Mat) battery features a sealed design, preventing leaks and corrosion, and is suitable for mounting in any position. Built to withstand shocks, vibrations, and high/low temperatures.
• ✅ Durable & Reliable：Constructed to provide long-lasting durability with ISO9001/CE/UL certifications, the Daakmax YTX14-BS ensures a high level of reliability in rugged and demanding conditions.

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MAYICHUAN Battery Box Cover – Affordable Protection

Another excellent option for replacing your Rhino 660 battery cover is the MAYICHUAN lid. It’s designed to fit 2004-2007 Rhino 660 and 2006-2009 Rhino 450 models, serving as a direct replacement for OEM part 5UG-H2129-10-00. The lid is made from high-quality ABS plastic with good hardness and rigidity, so it won’t crack easily under trail stress. It also provides excellent abrasion resistance, keeping your battery safe from rocks and debris.

Installation is simple: remove the protective film, clip the lid into place, and secure it with a screw (not included). The lid effectively prevents moisture and dust from entering the battery compartment, which can prolong battery life by reducing corrosion. At its price point, it’s an inexpensive insurance policy for your new battery. If your original lid is damaged, this is a no-brainer replacement.

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• Compatibility: Battery cover box lid replace for Yamaha Rhino accessory 5UG-H2129-10-00, fits for 2006 – 2009 Yamaha Rhino 450 (YXR450F) and 2004 – 2007 Yamaha Rhino 660 (YXR660F) battery box cover
• Function: Cover the battery cover lid, prevent moisture, dust and other damage from the outside world
• High Quality: The battery cover is made of high quality abs plastic with high hardness and rigidity, good abrasion resistance
• Easy Installation: Simply remove the protective film, attach the clip to the appropriate connector, and then secure one of the edges with screw (not included)
• Good service: MAYICHUAN aims to provide excellent products and best service for customers

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Buyer’s Guide: What to Consider

Choosing the right battery for your Yamaha Rhino 660 isn’t just about picking one that fits. You need to consider how you use your UTV, what climate you ride in, and what accessories you’ve added. This buying guide breaks down the key factors to help you make an informed decision.

• Battery Type: AGM vs. SLA vs. Lithium: Most Rhino 660 batteries are sealed lead-acid (SLA) with AGM (absorbent glass mat) technology, which is maintenance-free and spill-proof. AGM batteries offer good vibration resistance and deep discharge recovery. Lithium batteries are lighter and have higher CCA but cost more and require a special charger. For most riders, a quality AGM battery is the best balance of price and performance.
• Cold Cranking Amps (CCA): CCA measures how much current the battery can deliver at 0°F for 30 seconds. For the Rhino 660, a minimum of 200 CCA is recommended for moderate climates, but 270-300 CCA is better for cold-weather starting or if you have a winch and lights. Higher CCA gives you a safety margin, especially if your engine is hard to start.
• Physical Dimensions and Fitment: The Rhino 660 battery tray is designed for a standard YTX20L-BS size (about 6.88 x 3.50 x 6.13 inches). Always check dimensions against your existing battery. Some larger batteries like the U1 group may require tray modifications. Also verify terminal polarity (negative left, positive right for YTX20L-BS).
• Maintenance Requirements: All the batteries reviewed here are sealed and maintenance-free—no need to add water. However, keep terminals clean and tight. If you choose a lithium battery, you may need a specific charger to prevent damage. For AGM/SLA, a standard automatic charger works fine.
• Accessory Load and Reserve Capacity: If you run a winch, lights, or other electrical accessories, look for a battery with higher amp-hour (Ah) rating. Standard YTX20L-BS offers 18Ah, while the U1 35Ah provides nearly double the reserve. More capacity means you can run accessories longer without draining the battery.
• Protection from the Elements: A battery cover lid (like the M MATI or MAYICHUAN) is essential to keep moisture, mud, and debris out of the battery compartment. A damaged or missing lid can lead to corrosion, short circuits, and premature battery failure. Always ensure your lid is intact or replace it when installing a new battery.
• Brand Reputation and Warranty: Stick with established brands like Mighty Max, ExpertPower, or UpStart that offer at least a 12-month warranty. Generic no-name batteries may save money upfront but can fail sooner. Check return policies and customer reviews to gauge real-world reliability.

Conclusion

Your Yamaha Rhino 660 deserves a battery that starts reliably every time, whether you’re exploring trails, working the land, or just enjoying a weekend ride. From the high-CCA Mighty Max models to the convenience of the UpStart factory-activated battery, there’s an option that fits your specific needs. Don’t forget to pair your new battery with a quality cover lid to protect it from the elements.

If we had to pick a top recommendation, the Mighty Max YTX20L-BS (B00NUAAJZ8) offers an excellent balance of cold cranking power, weatherproof construction, and direct fitment for most Rhino 660 owners. For those who need extra capacity for heavy accessories, the Mighty Max U1 35Ah is a solid upgrade. And if your battery cover is cracked or missing, grab the M MATI lid—it’s a cheap fix that pays off in battery life. Whichever you choose, you’ll be back on the trail with confidence.