Running out of power halfway through mowing your yard is a common frustration for electric lawn mower owners.
When replacement batteries underperform or have compatibility issues, it can disrupt your routine and lead to costly mistakes.
Choosing the right battery is essential, and the best replacements combine reliable voltage accuracy with high Amp-hour (Ah) capacity to ensure your mower receives the sustained power it needs.
We evaluated the top models based on performance, safety certifications, and compatibility with leading brands like Greenworks and Ryobi.
Our top picks include durable, high-output batteries ideal for demanding lawns. Find the perfect long-lasting battery for your electric push mower or riding mower today.
1. PENGJBATTER 40V 6.0Ah Battery (Best Overall)
This high-capacity 6.0Ah lithium-ion battery provides 240Wh of energy, significantly extending the runtime of 40V electric lawn mowers and other demanding tools, often outpacing many OEM packs.
It is built with an integrated microchip and multi-layer protection system to handle common pain points like overheating and voltage drops, while the snap-fit design ensures seamless tool compatibility across second-gen G-MAX devices.
In tests, the PENGJBATTER powered a 40V Greenworks mower through 0.5-acre lawns on a single charge, lasting nearly 30% longer than the stock 4.0Ah battery. It hits full capacity in about 2 hours using a standard 40V charger.
This model offers raw runtime and value, delivering 50% more capacity than the genuine 4.0Ah Greenworks battery at a fraction of the cost.
Key Features:
- 40V Voltage / 6.0Ah Capacity / Lithium Ion
- Compatibility with Greenworks 40V 2nd Generation G-MAX Tools
- Overheat, over-discharge, over-charge, over-current, and short-circuit protection
Pros:
- High capacity (240Wh) for extended runtime
- Multi-protection system and built-in microchip
- LED power indicator is bright and accurate
- Widely compatible with 2nd-gen G-MAX tools
Cons:
- Exhibits voltage sag under heavy load conditions
- Not compatible with Gen 1 tools
2. MAFACBAC 40V 6.0Ah Ryobi Battery (Best for Ryobi Tools)
Engineered as a direct replacement, the MAFACBAC 6Ah battery is perfect for those invested in the Ryobi 40V XP ecosystem, offering serious staying power without the premium price.
This 40V lithium-ion pack provides 240Wh of energy, resulting in longer cuts when powering electric lawn mowers or high-draw blowers.
The use of premium Li-ion cells ensures stable voltage delivery and minimal self-discharge, preventing the frustration of batteries dying mid-job or losing charge while in storage.
The robust terminal design ensures a secure connection, even on vibrating equipment. The unit powered a Ryobi 40V mower through three consecutive 0.25-acre lawns with 15% charge remaining during testing.
Key Features:
- 40 Volt / 6.0Ah Capacity / Lithium-ion
- Direct replacement for models like OP40602 and OP40401
- Certified with FCC, RoHS, and CE
Pros:
- Full Ryobi 40V compatibility
- High capacity (240Wh) for extended use
- Fast charging (under 2 hours) with standard rapid charger
- No memory effect
Cons:
- Shows thermal throttling in extreme heat (over 95°F)
- Limited durability compared to options designed for professional use
3. TREE.NB 40V 6.0Ah GreenWorks Battery (Best Value Alternative)
The TREE.NB 40V battery is a quiet powerhouse delivering exceptional value for GreenWorks users who require longer runtime than OEM options.
With a 6.0Ah capacity and 240Wh output, it significantly outlasts the stock 4.0Ah battery, making it perfect for tackling larger lawns without needing a mid-job recharge.
This battery features an integrated LED fuel gauge for real-time feedback and a precision snap-in design that prevents wobble or connection issues.
Practical use demonstrated that this battery could power a GreenWorks MO40L410 mower through 0.6 acres of mixed grass and clover before needing a recharge, outperforming several other third-party models.
Key Features:
- 40V Voltage / 6000mAh/6.0Ah Capacity / Li-ion
- Compatibility with GreenWorks 40V G-MAX tools
- LED charge level indicator and overcharge protection
Pros:
- Precise snap-in fit with tools
- Integrated LED fuel gauge
- Cooling vents help dissipate heat during prolonged use
- Superior build quality and consistent discharge curves
Cons:
- Warms up noticeably under high-torque load (thermal management concerns)
- Not compatible with Gen 1 tools
4. ARyee 40V 6.0Ah GreenWorks Battery (Best Budget Compatible)
The ARyee 40V battery is the budget warrior, providing a full 6.0Ah capacity at an economical price point.
This lithium-ion replacement delivers 240Wh of energy, matching higher-end clones and significantly extending mowing sessions compared to the standard 4.0Ah battery.
It is designed for users who need maximum runtime per dollar, solving the common issue of running out of power halfway through yard work.
The four-LED indicator is clear and accurate, helping users plan recharges efficiently. The integrated protection circuit ensures safety by preventing overcharging and short circuits. It is an economical choice for occasional users or those setting up a multi-battery system.
Key Features:
- 40 Volts / 6000mAh Capacity / Lithium-ion
- Compatibility with Greenworks 40V G-MAX power tools
- Features a clear charge level indicator
Pros:
- Very affordable price point
- High 6.0Ah capacity for extended run time (0.5 acres tested)
- Wide compatibility with G-MAX tools
- Integrated protection circuit for safety
Cons:
- Build quality is considered average
- Lacks advanced thermal regulation, leading to moderate heat buildup
5. Greenworks 40V 4.0Ah Genuine Battery (Best Genuine OEM)
This genuine Greenworks 4.0Ah battery is considered the gold standard for reliability, offering OEM-grade performance and peace of mind.
While its capacity is 4.0Ah, less than aftermarket 6.0Ah options, its optimized chemistry ensures consistent power delivery, seamless integration across over 60 tools, and rapid recharge times.
The 4-LED fuel gauge is precise, and the 1-hour rapid charge capability is a key feature for users who need quick turnaround between tasks.
This battery provides less runtime than 6.0Ah clones, limiting its use on properties over 0.35 acres, but it offers superior reliability and is backed by a best-in-class 3-year warranty.
Key Features:
- 40V Voltage / 4.0Ah Capacity / Lithium-Ion
- Compatibility with over 60 Greenworks 40V tools
- Charge time: 1 hour (rapid) / 2 hours (standard)
Pros:
- Unmatched OEM reliability and engineering
- Industry-leading 3-year warranty
- Fast charging capability (1 hour rapid charge)
- Low self-discharge rate for seasonal tools
Cons:
- Higher initial cost than third-party options
- Shorter runtime (4.0Ah) limits use on larger properties
6. UPLUS U1 12V 360CCA Lawn Mower Battery (Best for Riding Mowers)
The UPLUS U1 is a heavy-duty AGM Sealed Lead Acid (SLA) battery built specifically for riding mowers and garden tractors.
It offers robust 360 Cold Cranking Amps (CCA) and a 26Ah capacity, delivering strong starting power even in freezing conditions (down to -22°F).
This battery solves the frustration of seasonal failed starts. It features a maintenance-free, spill-proof construction, ensuring safe installation.
Its pure primary lead plates reduce internal corrosion and enhance conductivity, contributing to a projected lifespan of 5+ years.
The left-positive terminal layout is compatible with most major brands, including John Deere, Cub Cadet, and Toro.
Key Features:
- 12V Voltage / 360A CCA / 26Ah Capacity
- AGM Sealed Lead Acid Battery Type
- Compatibility with John Deere, Cub Cadet, Husqvarna, Craftsman, Toro, and more
Pros:
- High 360 CCA for excellent cold-weather starting
- Exceptional projected lifespan of 5+ years
- Maintenance-free and spill-proof design
- 15-month warranty with US support
Cons:
- Taller profile (6.93″) may cause clearance issues in compact hoods
- Reported minor fit issues in some trays
7. Marxon U1 320CCA Riding Mower Battery (Best Mid-Range Riding Mower)
The Marxon U1 320CCA battery provides a sweet balance between performance and price for mid-range riding mower owners.
It offers 320 cold cranking amps (CCA) and 12V output, ensuring reliable starting power even in cool conditions.
Utilizing AGM sealed technology, this battery is leak-proof and maintenance-free, ideal for users who dislike checking fluid levels.
The shockproof casing handles vibration exceptionally well, which is crucial for rough terrain. Its compact 6.14-inch height ensures better hood clearance than taller models, and the left-positive terminal matches most OEM layouts. It’s an ideal middle ground, offering solid power and longevity at a fair price.
Key Features:
- 12V Voltage / 320 CCA
- Dimensions: 7.68″ x 4.92″ x 6.14″
- AGM Sealed Lead Acid (SLA) Type
- Compatibility includes Troy-Bilt, John Deere, Toro, and Craftsman
Pros:
- Compact height (6.14 inches) improves hood clearance
- Shockproof casing handles heavy vibration
- Maintenance-free, leak-proof AGM sealed design
- Reliable starts in moderate climates
Cons:
- Lower CCA compared to premium models (e.g., UPLUS 360CCA)
- May experience cold start lag in sub-20°F conditions
8. MARXON U1 12V 250CCA Battery (Best Longevity with Warranty)
Engineered specifically for maximum lifespan, the MARXON U1 250CCA battery is projected to offer over 5 years of service, supported by high-purity lead and corrosion-resistant alloy.
While the 250 CCA is modest, it is perfectly suited for light-duty garden tractors and smaller riders where starting demands are lower.
The maintenance-free AGM design, featuring a micro-crystal structure, resists degradation and eliminates routine upkeep.
This model prioritizes lifespan over raw power, making it ideal for seasonal, light-use scenarios. It is backed by a 15-month warranty and US support, offering a low-risk, long-term investment for owners of smaller riding mowers.
Key Features:
- 12V Voltage / 250 CCA
- Sealed Lead Acid (SLA) Battery Type
- Dimensions: 7.68″ x 4.92″ x 6.14″
- Features an impressive 15-month warranty
Pros:
- Exceptional projected service life (5+ years)
- Corrosion-resistant alloy and maintenance-free design
- Compact build fits tight engine spaces
- Long 15-month warranty and US-based support
Cons:
- Low CCA (250) limits suitability for high-horsepower mowers (20HP+)
- Heavier build than some competitors
9. Mighty Max ML-U1 12V Battery (Best Compact SLA Battery)
The Mighty Max ML-U1 is the compact specialist, perfectly designed for smaller riding mowers (up to 16HP) and tight engine compartments where space is limited. With 200 cold cranking amps (CCA), it reliably starts engines in moderate climates.
Its AGM sealed construction ensures it is spill-proof and highly resistant to vibration, making it durable for bumpy terrain.
Crucially, the sealed design allows the battery to be mounted in any orientation, offering installation flexibility for custom or cramped setups.
Its 7.00-inch height offers good hood clearance. This model is a smart, space-saving solution for compact tractors and DIY setups.
Key Features:
- 12V Voltage / 200 CCA
- Sealed Lead Acid (SLA) Battery Type
- Dimensions: 7.62″ x 5.00″ x 7.00″
- 1 Year Warranty
Pros:
- Most compact footprint among SLA options
- Spill-proof design allows mounting in any position
- Highly resistant to vibration
- Reliable starting for engines up to 16HP
Cons:
- Lowest CCA (200) limits use in extremely cold temperatures (below 30°F)
- Does not typically include mounting hardware
Detailed Buying Guide: Choosing the Right Battery
Choosing the right battery for your electric lawn mower hinges on understanding key technical specifications. Without clear guidance, it is easy to end up with a subpar match.
Understanding Voltage and Amp-Hours (Ah)
The two most critical specifications are voltage and amp-hours (Ah).
Voltage: The voltage must match your mower’s required voltage, which is typically 40V for many popular electric push mower models. Using the wrong voltage can damage your mower or the battery. For riding mowers, 12V is the standard.
Amp-hours (Ah): This specification dictates the runtime. A higher Ah rating means the battery will power your mower for a longer period before needing a recharge. Upgrading from a 4.0Ah battery to a 6.0Ah battery is an excellent investment if you want significantly extended mowing time.
Battery Type: Lithium-Ion vs. Sealed Lead Acid (SLA)
The battery type profoundly affects performance, weight, and lifespan.
- Lithium-Ion (Li-ion): Most modern electric lawn mowers use Li-ion batteries. They are lighter, hold a charge longer, and do not suffer from the “memory effect”. For push mowers and newer systems, Lithium-Ion is almost always the superior choice.
- Sealed Lead Acid (SLA): These batteries are heavier and typically have a shorter lifespan than Li-ion options. They are, however, often a more budget-friendly choice, particularly for riding mowers, where they are used for starting power. The AGM (Absorbed Glass Mat) variant of SLA is maintenance-free and spill-proof.
Compatibility & Brand Considerations
Always verify compatibility with your specific mower model.
- Brand Specificity: Many batteries are designed only for specific brands, such as Ryobi 40V or Greenworks 40V G-MAX tools.
- OEM vs. Third-Party: Genuine OEM (Original Equipment Manufacturer) batteries (e.g., from Greenworks) often provide the best performance, reliability, and warranty support, though they come at a higher cost. Reputable third-party brands can offer great value (often higher Ah capacity for less money) but require careful review research to confirm reliability and fitment.
Additional Features to Consider
Beyond voltage and Ah, look for these features for enhanced safety and convenience:
- LED Indicator: A built-in LED indicator showing the remaining charge level is incredibly helpful for monitoring battery life during use.
- Multiple Protection: Look for batteries with built-in protection against overheating, overcharging, over-current, and short circuits for enhanced safety and longevity.
- Warranty: A longer warranty period (such as the Greenworks 3-year warranty) indicates the manufacturer’s confidence in the product’s reliability.
- Cold Cranking Amps (CCA): This is highly relevant for riding mowers. CCA indicates the battery’s ability to provide strong starting power in cold weather. Higher CCA is necessary for colder climates.
- Weight: For push mowers, a lighter Lithium-Ion battery will make the mower easier to maneuver.