Running out of power halfway through mowing is a common frustration for electric lawn mower owners, especially when replacement batteries fail to meet expectations. Short runtimes, inconsistent performance, and compatibility issues can disrupt your yard routine and lead to costly mistakes when choosing a new battery. Without clear guidance, it’s easy to end up with a subpar match that underperforms or damages your mower.
The best replacements combine reliable voltage accuracy with high Ah capacity, ensuring your mower gets the sustained power it needs. We evaluated top models based on performance, safety certifications, and compatibility with leading brands, focusing on options that integrate seamlessly with your existing system. Our research includes insights from trusted sources like Consumer Reports and ToolGuyd, helping you choose with confidence.
Our top picks include durable, high-output batteries ideal for demanding lawns, with recommendations tailored to specific models and power needs. For corded mowers, check our guide to best electric push mowers and best mulching mowers. You can also explore our full review of best lawn mower batteries and battery-powered yard tools for more expert-tested options. Find the perfect long-lasting battery for your mower today.
Our Top Picks

PENGJBATTER 40V 6.0Ah Battery
Best Overall
- 40V
- 6.0Ah
- Lithium Ion
- Greenworks 40V 2nd Generation G-MAX Tools
- Overheat, over-discharge, over-charge, over-current, and short-circuit protection

MAFACBAC 40V 6.0Ah Ryobi Battery
Best for Ryobi Tools
- 40 Volt
- 6.0Ah
- Lithium-ion
- Ryobi 40V Lawn Mower
- FCC RoHS CE

TREE.NB 40V 6.0Ah GreenWorks Battery
Best Value Alternative
- Li-ion
- 40V
- 6000mAh\/6.0Ah
- GreenWorks 40V G-MAX
- LED charge level indicator\/overcharge protection

ARyee 40V 6.0Ah GreenWorks Battery
Best Budget Compatible
- Lithium-ion
- 40Volts
- 6000mAh
- Greenworks 40V G-MAX power tools
- Charge level indicator

Greenworks 40V 4.0Ah Genuine Battery
Best Genuine OEM
- 40V
- 4.0Ah
- 60+ tools
- 1 hour (rapid) / 2 hours (standard)
- 3 years

UPLUS U1 12V 360CCA Lawn Mower Battery
Best for Riding Mowers
- AGM Sealed Lead Acid
- 12V
- 360A
- 26Ah
- John Deere, Cub Cadet, Husqvarna, Craftsman, Toro, Ariens, Poulan Pro, Troy-Bilt

Marxon U1 320CCA Riding Mower Battery
Best Mid-Range Riding Mower
- 12V
- 320
- 7.68″ x 4.92″ x 6.14″
- Positive on Left, Negative on Right
- Troy-Bilt, John Deere, Toro, Cub Cadet, Craftsman, Ariens Poulan Pro Massey Ferguson

MARXON U1 12V 250CCA Battery
Best Longevity with Warranty
- 12V
- 250
- Sealed Lead Acid (SLA)
- 7.68″ x 4.92″ x 6.14″
- 15 months

Mighty Max ML-U1 12V Battery
Best Compact SLA Battery
- 12V
- 200
- Sealed Lead Acid (SLA)
- 7.62″ x 5.00″ x 7.00″
- 1 Year
Battery For Electric Lawn Mower Review
Choosing the Right Battery for Your Electric Lawn Mower
Understanding Voltage and Amp-Hours (Ah)
The two most important specifications when choosing a replacement battery for your electric lawn mower are voltage and amp-hours (Ah). Voltage must match your mower’s requirement – typically 40V for many popular models. Using the wrong voltage can damage your mower or the battery. Amp-hours (Ah) dictates runtime – a higher Ah rating means the battery will power your mower for a longer period before needing a recharge. If you want to significantly extend your mowing time, upgrading to a battery with a higher Ah rating (e.g., from 4.0Ah to 6.0Ah) is a great investment.
Battery Type: Lithium-Ion vs. Sealed Lead Acid (SLA)
Most modern electric lawn mowers utilize Lithium-Ion (Li-ion) batteries. These are lighter, hold a charge longer, and don’t suffer from the “memory effect” seen in older battery technologies. Sealed Lead Acid (SLA) batteries are heavier and generally have a shorter lifespan, but can be a more budget-friendly option, particularly for riding mowers. For push mowers and newer systems, Lithium-Ion is almost always the superior choice.
Compatibility & Brand Considerations
Always verify compatibility with your specific mower model. Many batteries are designed for specific brands (Greenworks, Ryobi, etc.). While some aftermarket options exist, ensure they are explicitly listed as replacements for your mower. Genuine OEM (Original Equipment Manufacturer) batteries, like those directly from Greenworks, often offer the best performance and warranty support, though they can be pricier. Reputable third-party brands can provide good value, but research reviews and confirm compatibility before purchasing.
Additional Features to Consider
- 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, and short circuits for enhanced safety and longevity.
- Warranty: A longer warranty period indicates the manufacturer’s confidence in the product’s reliability.
- Weight: Especially for push mowers, a lighter battery will make the mower easier to maneuver.
- Cold Cranking Amps (CCA): This is more relevant for riding mowers, indicating the battery’s ability to start in cold weather.
Battery Comparison for Electric Lawn Mowers
Product | Voltage | Capacity (Ah) | Battery Type | Compatibility | LED Indicator | Warranty | Special Features |
---|---|---|---|---|---|---|---|
PENGJBATTER 40V 6.0Ah | 40V | 6.0Ah | Lithium Ion | Greenworks 40V (2nd Gen, some exceptions) | Yes | Not specified | Multiple Protections (Overcharge, etc.) |
MAFACBAC 40V 6.0Ah Ryobi Battery | 40V | 6.0Ah | Lithium-ion | Ryobi 40V Tools (wide range of models) | No | 30-day return, 12-month service | High Capacity, FCC/RoHS/CE Certified |
TREE.NB 40V 6.0Ah GreenWorks Battery | 40V | 6.0Ah | Li-ion | Greenworks 40V G-MAX (2nd Gen, some exceptions) | Yes | Not specified | Fuel Gauge, Exothermic Holes |
ARyee 40V 6.0Ah GreenWorks Battery | 40V | 6.0Ah | Lithium-ion | Greenworks 40V G-MAX (wide range, some exceptions) | Yes | Not specified | Multiple Protections, FCC/RoHS/CE Certified |
Greenworks 40V 4.0Ah Genuine Battery | 40V | 4.0Ah | Lithium-Ion | All Greenworks 40V Products | Yes | 3 Year | 50% More Capacity than 2.0Ah, Fast Charge |
UPLUS U1 12V 360CCA Lawn Mower Battery | 12V | 26Ah | Sealed Lead Acid AGM | John Deere, Cub Cadet, Husqvarna, etc. (Riding Mowers) | No | 15 Month | Long Life (5+ years), Vibration Resistant |
Marxon U1 320CCA Riding Mower Battery | 12V | Not Specified | Sealed Lead Acid (SLA) | Craftsman, Cub Cadet, Husqvarna, etc. (Riding Mowers) | No | 15 months | Shockproof Material, Corrosion Resistant |
MARXON U1 12V 250CCA Battery | 12V | Not Specified | Sealed Lead Acid (SLA) | Various Riding Mowers | No | 15 months | Long Life (5+ years), Shockproof Material |
Mighty Max ML-U1 12V Battery | 12V | Not Specified | Sealed Lead Acid (SLA) | Various Riding Mowers | No | 1 Year | Spill Proof, Wide Operating Temperatures |
Data-Driven Battery Selection for Electric Lawn Mowers
Evaluating battery for electric lawn mower options requires analyzing performance data and understanding key specifications. We focused on comparative runtime data published by manufacturers and independent review sites like Consumer Reports and ToolGuyd.com, prioritizing Lithium-Ion batteries due to their superior energy density and lifespan compared to SLA options.
Our analysis centered on Amp-hour (Ah) ratings and their correlation to reported mowing times for comparable mower models. We assessed user reviews on platforms like Amazon and Home Depot, filtering for mentions of runtime discrepancies and battery failure rates. Data consistently showed a strong positive correlation between Ah and mowing duration, but also highlighted the impact of mowing conditions (grass height, terrain) on actual performance.
Furthermore, we examined warranty terms offered by various brands (Greenworks, Ryobi, EGO) as an indicator of product reliability. Price per Ah was calculated to determine value, factoring in both OEM and third-party options. Compatibility checks were performed using manufacturer parts finders to ensure accurate fitment for common mower models, verifying voltage requirements were met. This research informs our recommendations, prioritizing batteries offering optimal runtime, durability, and value.
FAQs
What voltage battery do I need for my electric lawn mower?
The voltage of your replacement battery for electric lawn mower must match the original battery’s voltage. Most common electric lawn mowers use a 40V battery, but always check your mower’s specifications to ensure compatibility. Using the wrong voltage can damage your mower or battery.
What’s the difference between Lithium-Ion and SLA batteries?
Lithium-Ion (Li-ion) batteries are lighter, last longer, and don’t have memory issues. Sealed Lead Acid (SLA) batteries are heavier and don’t last as long, but are typically more affordable, especially for riding mowers. For most push mowers, Lithium-Ion is the better choice.
What does ‘Ah’ (Amp-hours) mean, and why is it important?
Amp-hours (Ah) determine the runtime of your battery for electric lawn mower. A higher Ah rating means the battery will power your mower for a longer period before needing to be recharged. Upgrading to a higher Ah battery is a good way to extend your mowing time.
Is it better to buy a genuine OEM battery or a third-party option?
Genuine OEM (Original Equipment Manufacturer) batteries, like those from Greenworks, typically offer the best performance and warranty. However, reputable third-party brands can provide good value, but it’s critical to verify compatibility with your mower model and read reviews before purchasing.
The Bottom Line
Choosing the right battery for your electric lawn mower hinges on understanding voltage, amp-hours, and battery type. Prioritize matching the correct voltage for compatibility and consider a higher Ah rating for extended runtime, especially if tackling larger yards.
Ultimately, investing in a quality Lithium-Ion battery – whether OEM or a well-reviewed third-party option – will provide reliable power and longevity. Don’t forget to check for helpful features like LED indicators and robust warranty coverage for peace of mind.