8 Best 40 Volt Batteries for Lawn Mowers to Buy in 2025

If you’re tired of mid-mow shutdowns and crave unmatched runtime, the Cheerlark 7.5Ah 40V battery is a game-changer. Boasting a massive 300Wh capacity—the highest in this lineup—it delivers up to 50% longer runtime than standard 6.0Ah packs, making it ideal for large lawns and power-hungry Ryobi tools. The premium lithium-ion cells ensure stable voltage output from full to empty, preventing the dreaded “brownout” that weakens performance in cheaper clones. For users fed up with frequent recharging and inconsistent power, this battery offers serious endurance and reliability in one robust package.

In real-world testing across multiple Ryobi tools—especially high-draw devices like mowers and blowers—the Cheerlark maintained strong performance even under load, with minimal voltage sag. The built-in 4-LED power indicator is a standout, giving precise charge feedback so you’re never caught off guard mid-task. While it’s slightly heavier than stock batteries due to the high-density cells, the trade-off is worth it for extended operation. However, it’s worth noting that peak output may lag slightly behind genuine Ryobi high-output models during sustained heavy-duty use, such as thick brush clearing.

Positioned between budget clones and OEM pricing, the Cheerlark competes best against the 6.0Ah third-party options while offering 25% more capacity than most. It’s the clear choice for homeowners with large yards or frequent tool use who want maximum runtime without investing in multiple smaller batteries. Compared to the Biswaye 6.0Ah, it provides significantly longer runtime and better charge retention, though at a higher price point—making it a premium pick for those who prioritize raw capacity over cost savings.

The Biswaye 40V 6Ah battery delivers serious value without sacrificing performance, making it the go-to for budget-conscious users who still want reliable power. With 6,000mAh capacity, it doubles the runtime of standard 3.0Ah Ryobi batteries, giving you enough juice to tackle medium to large lawns on a single charge. The high-quality lithium-ion cells ensure consistent power delivery, while the integrated circuit protection guards against overcharging, overheating, and short circuits—critical for long-term tool health. If you’re upgrading older, worn-out batteries without breaking the bank, this is a smart, no-frills solution.

During testing with a Ryobi 40V lawn mower and string trimmer, the Biswaye performed admirably, maintaining full power through most of a 1/2 acre yard. The onboard LED power indicator lets you check charge status at a glance, a small but essential feature missing on some ultra-cheap clones. It fits seamlessly into all compatible tools and chargers, including OP401 and ZROP401, with no adapter needed. While it doesn’t match the peak output or thermal management of OEM high-output batteries, it handles standard mowing and trimming with ease—though it may struggle slightly during back-to-back heavy-duty tasks.

Compared to the KUNLUN 6.0Ah, the Biswaye offers nearly identical specs and performance at a slightly lower price, making it the most cost-effective entry point into high-capacity Ryobi power. It’s ideal for DIYers and weekend warriors who need dependable runtime without investing in pricier OEM or high-output alternatives. While it lacks the extended durability claims of some competitors, it holds its own against the Cheerlark and KUNLUN models in real-world use—offering the best blend of affordability, compatibility, and solid performance.

Engineered for demanding outdoor tasks, this 40V 6.0Ah high-output battery is built to handle the kind of punishing jobs where most clones tap out. With 6-layer circuit protection and industrial-grade thermal resilience, it operates reliably in extreme conditions—from freezing winter mornings to scorching summer afternoons (-4°F to 122°F). The 33% longer runtime than 4.0Ah models means you can power through thick grass, wet leaves, or overgrown hedges without interruption. For users pushing their Ryobi tools to the limit, this battery delivers rugged dependability and sustained power delivery where it matters most.

Real-world testing with a Ryobi 40V mower and chainsaw showed minimal voltage drop under load, even during prolonged use. The 4-LED charge indicator provides clear, accurate feedback, helping you plan swaps efficiently. Unlike many third-party batteries that throttle output under heat, this one maintains performance thanks to its advanced thermal regulation and high-output cell configuration. It’s also one of the few clones explicitly rated for snow blowers and impact tools, expanding its versatility beyond lawn care. However, it’s slightly bulkier than OEM, and the plastic housing feels less premium than genuine Ryobi packs.

When compared to the Biswaye 6.0Ah, this high-output model excels in durability and sustained performance, especially in cold weather or high-drain applications. It’s the best pick for users with heavy-duty outdoor toolkits who need a reliable, all-season workhorse. While it doesn’t offer the capacity of the Cheerlark 7.5Ah, it outperforms it in high-power scenarios thanks to better thermal and electrical design. For those upgrading from standard batteries, this offers the closest experience to genuine Ryobi high-output performance—just without the OEM price tag.

For Greenworks users seeking maximum value without sacrificing compatibility, the MAFACBAC 29472 6.0Ah battery is a standout budget option. Designed specifically for Greenworks G-MAX 40V tools, it delivers double the runtime of standard 3.0Ah packs, making it perfect for mid-sized lawns and extended trimming sessions. The premium lithium-ion cells ensure stable power output and fast charging, while the no-memory-effect design means you can recharge it anytime without degrading lifespan. If you’re tired of underpowered clones that fail after a few months, this model offers solid build quality and long-term reliability at a fraction of OEM cost.

In testing with a Greenworks 40V lawn mower and leaf blower, the battery held strong through full tasks without sudden dropouts. It fits perfectly in all compatible tools and charges efficiently on the 29482 and similar chargers. The FCC, CE, and RoHS certifications confirm it meets safety standards, and the low self-discharge rate means it stays charged when stored. However, it lacks an onboard fuel gauge, so you’ll need to estimate remaining power—a notable omission compared to higher-end models. Also, while it handles standard mowing well, it may struggle with dual-blade mowers or wet grass under continuous load.

Compared to the genuine Greenworks 4.0Ah, this MAFACBAC battery offers greater capacity at less than half the price, making it the best budget alternative for cost-conscious buyers. It’s ideal for homeowners who want longer runtime without investing in multiple OEM packs. While it doesn’t match the refined engineering or warranty of the official Greenworks battery, it delivers 90% of the performance at a fraction of the cost—a compelling trade-off for practical users.

For Ryobi users who value convenience and redundancy, this 2-pack of 6.0Ah batteries is a smart investment in uninterrupted productivity. Offering two high-capacity batteries for under $85, it’s the most cost-effective way to double your runtime and eliminate downtime. Each battery delivers 6,000mAh of power, enough to mow, trim, and blow without constant recharging. The top-grade A-cell construction ensures stable voltage and optimized communication with Ryobi tools and chargers, reducing error codes and charging issues common in cheaper clones. If you hate stopping mid-job, this duo keeps you moving.

Testing with a Ryobi 40V mower confirmed that one battery easily handles a 1/2 acre yard, while the second lets you rotate seamlessly. Both units fit perfectly in OP401 and ZROP401 chargers, with consistent charge cycles and no compatibility hiccups. The lack of individual LED indicators on some units is a minor downside, but most models include the 4-light display. While they don’t offer high-output performance for chainsaws or snow blowers, they excel in standard lawn and garden applications. Over time, they show good cycle retention, though long-term durability data is still emerging.

Compared to buying two separate Biswaye or KUNLUN batteries, this 2-pack saves you over $20 while delivering identical capacity and compatibility. It’s the best choice for users who want a ready spare without paying OEM prices. While the Cheerlark 7.5Ah offers more runtime per battery, you’d need two of them at nearly double the cost. This 2-pack strikes the perfect balance of value, capacity, and practicality—ideal for homeowners who want maximum uptime with minimal hassle.

As the genuine Greenworks OEM battery, this 4.0Ah pack sets the gold standard for reliability, integration, and support. While it doesn’t have the raw capacity of third-party 6.0Ah clones, its optimized cell chemistry and system-wide communication ensure seamless performance across all Greenworks 40V tools. The 1-hour rapid charge time is a major advantage, letting you get back to work fast—something most clones can’t match. Combined with the integrated 4-LED fuel gauge and 3-year warranty, it’s the most trustworthy option for long-term ownership.

In real-world use, the battery delivers consistent, stable power without unexpected shutdowns, even in high-drain tools like dual-blade mowers. It charges fully on standard and rapid chargers without issue, and the diagnostic LEDs clearly indicate charge completion. While its 4.0Ah capacity limits runtime compared to larger clones, it’s sufficient for small to medium yards. The lack of heavy-duty thermal management means it can overheat under prolonged load, requiring cooldown periods. Still, its plug-and-play reliability makes it ideal for users who prioritize peace of mind over max runtime.

Compared to the MAFACBAC 6.0Ah, this OEM battery offers shorter runtime but superior build quality, faster charging, and longer warranty. It’s the best choice for users who value brand integrity, tool compatibility, and long-term support. While third-party batteries offer more capacity, none match the diagnostic precision and ecosystem integration of the genuine Greenworks pack. For those who treat their tools as long-term investments, this battery delivers unmatched confidence and performance consistency.

The Wild Badger 40V 4.0Ah battery stands out as the lightest and most portable option in this lineup, making it perfect for users who prioritize comfort and ease of use. Weighing noticeably less than most 6.0Ah clones, it reduces fatigue during extended trimming or edging sessions. Despite its compact size, it delivers solid 4.0Ah performance, sufficient for small to medium yards, and features minimal self-discharge so it’s ready when you are. The real-time LED charge monitor provides instant feedback, and the tool-agnostic design ensures compatibility across brands—ideal for mixed-tool households.

In testing, it performed reliably with a Greenworks mower and Ryobi trimmer, maintaining steady power without sudden drops. The quick-swap design makes transitions between tools effortless, and it charges efficiently on most 40V chargers. However, due to its lower capacity, it struggles on larger lawns or high-drain tools, requiring mid-job swaps. It also lacks advanced thermal protection, so it can overheat during back-to-back use. While it’s not built for heavy-duty tasks, it excels in light to moderate applications where comfort matters.

Compared to the Greenworks OEM 4.0Ah, the Wild Badger offers similar capacity and runtime but at a lower price, though without the 3-year warranty or rapid charging. It’s best suited for casual users, seniors, or those with small yards who want a light, reliable, and affordable battery. While it can’t match the endurance of 6.0Ah models, its lightweight design and cross-compatibility make it a standout for ergonomic performance—a rare win in a market focused on power over comfort.

Built for long-term durability and daily reliability, the KUNLUN 6.0Ah 40V battery is a top contender for users who demand consistent performance and rugged construction. With 6000mAh capacity and 500+ charge cycles, it’s designed to outlast cheaper clones while delivering stable power across all Ryobi 40V tools. The 4-LED battery life indicator and over-molded edges enhance usability and impact resistance, while CE, FCC, and RoHS certifications confirm its safety standards. For homeowners replacing worn-out OEM batteries, this offers OEM-like quality at a fraction of the cost.

Testing with a Ryobi lawn mower showed strong, uninterrupted performance across a 1/3 acre yard. It charges efficiently on OP401 and ZROP401 chargers, with no compatibility issues or error codes. The built-in protection suite—overcharge, overheat, short-circuit—ensures long-term battery and tool safety. While it doesn’t match high-output models in peak power, it handles standard mowing and trimming with ease. However, recharge time is slightly slower than OEM, and the housing, while durable, feels less premium.

Compared to the Biswaye 6.0Ah, the KUNLUN offers nearly identical performance but with better build quality and cycle life claims, making it the better long-term investment. It’s ideal for users who want a durable, high-capacity battery without stepping up to high-output pricing. While the Cheerlark 7.5Ah offers more runtime, the KUNLUN wins in balanced performance, safety, and longevity—making it the best choice for reliable everyday use.