Maintaining a pristine lawn requires reliable power, and for many modern cordless mowers, that means a dependable 40-volt battery. The right battery can mean the difference between finishing your yard work with ease or being left with an unmowed strip as the power fades. With so many options available, from brand-name originals to third-party replacements, selecting the best one for your needs is crucial for a seamless lawn care experience.
This roundup simplifies your search by highlighting ten of the best 40-volt batteries on the market. We’ve considered factors like compatibility, capacity for longer runtime, and built-in safety features to help you find the perfect power source. Whether you need a direct replacement for your Ryobi, a genuine Greenworks battery, or a high-capacity option for your DeWalt tools, you’ll find a compelling choice here to get you back to mowing.
Our Top Picks for 40 Volt Lawn Mower Batteries
- Biswaye 40V 6Ah Lithium Battery Replacement for Ryobi
- Compatible with Ryobi 40V 6.0Ah High-Output Battery
- MAFACBAC 29472 for Greenworks 40V Battery
- 2Pack 6.0Ah OP40601 Replacement for Ryobi 40V Battery
- Greenworks 40V 4.0Ah Lithium-Ion Battery
- Wild Badger Power WB40V4.0AHB 40 Volt 4.0Ah Battery
- KUNLUN 6.0Ah 40 Volt Lithium Battery for Ryobi
- HART 40 Volts 4.0Ah Lithium-Ion Battery
- xiixtoo DCB406 Replacement 6.0Ah 40V Battery
- EGO Power+ BA1400T 40V 5.0Ah ARC Lithium Battery
Biswaye 40V 6Ah Lithium Battery Replacement for Ryobi
This Biswaye battery is designed as an exact match for a wide range of Ryobi 40V tools, ensuring a seamless fit and performance. Its high-quality 6.0Ah capacity provides extended run time, which is noted to be twice as long as standard 3.0Ah batteries. This makes it a strong candidate for powering through larger lawns without interruption.
Compatibility is a key strength, as it works with numerous Ryobi lawn mowers, trimmers, and blowers. It is also designed to work with various Ryobi 40V battery chargers, making integration into your existing tool ecosystem straightforward. For users seeking a reliable aftermarket option to bring new life to their Ryobi tools, this battery presents a compelling solution.
Compatible with Ryobi 40V 6.0Ah High-Output Battery
This high-output battery is built for demanding tasks, offering a substantial 6.0Ah capacity that provides up to 60 minutes of continuous use. It is promoted as delivering 33% longer runtime than a standard 4.0Ah battery, which is ideal for tackling large properties or heavy-duty yard work. With over 500 charge cycles, it is also constructed for long-term, cost-effective use.
User safety and convenience are prioritized with a six-layer protection system that guards against overcharging, short-circuits, and other potential issues. The integrated 4-LED indicator allows for easy monitoring of the charge level, helping you plan your work sessions effectively. This battery combines extended power with smart features for a reliable user experience.
MAFACBAC 29472 for Greenworks 40V Battery
Specifically engineered for Greenworks G-MAX 40V systems, this 6.0Ah lithium-ion battery serves as a direct replacement for several original model numbers. It is designed to deliver the consistent power required by lawn mowers and other demanding outdoor power tools. This makes it an excellent option for Greenworks owners looking for an alternative power source.
The battery is compatible with a long list of Greenworks tools, including trimmers, leaf blowers, and of course, lawn mowers. It is also noted to work with the Greenworks 29482 charger. For those invested in the Greenworks ecosystem, this battery offers a way to maintain tool performance without being limited to the original manufacturer’s parts.
2Pack 6.0Ah OP40601 Replacement for Ryobi 40V Battery
This product offers exceptional value by including two high-capacity 6.0Ah batteries in a single pack. Each battery features a 6000mAh capacity, which provides significantly more run time compared to standard options. The use of top-grade battery cells aims to ensure optimized performance and longevity for your cordless tools.
Having two batteries means you can power one tool while the other charges, effectively eliminating downtime during larger projects. They maintain wide compatibility with Ryobi 40V tools and chargers, covering many popular lawn mower and trimmer models. This twin-pack is a practical solution for users who need extended, uninterrupted power for their yard work.
Greenworks 40V 4.0Ah Lithium-Ion Battery
As a genuine Greenworks product, this 4.0Ah battery is guaranteed to be compatible with over 60 tools in the 40V lineup. It offers 50% more capacity than the standard 2.0Ah battery, providing a solid balance of runtime and power for a variety of tasks, from mowing to blowing leaves.
The lithium-ion technology means there is no memory effect and very low self-discharge, allowing the battery to hold its charge for longer when not in use. An integrated 4-LED fuel gauge gives you immediate feedback on the remaining charge, so you’re never caught off guard by a low battery. For owners of Greenworks tools, this is the official and reliable choice for power.
Wild Badger Power WB40V4.0AHB 40 Volt 4.0Ah Lithium-Ion Battery
The Wild Badger Power battery is designed as a versatile power source for a wide array of 40V tools, including lawn mowers, string trimmers, and chainsaws. Its 4.0Ah capacity provides a reliable amount of power for typical yard maintenance tasks. The design emphasizes user-friendly installation for effortless switching between different tools.
Convenience is enhanced with LED lights that provide real-time updates on the charging progress and battery status. This allows you to easily check how much power is left before you start a job. It’s a solid general-purpose battery for those who own multiple 40V tools from various brands that share a compatible form factor.
KUNLUN 6.0Ah 40 Volt Lithium Battery for Ryobi
KUNLUN offers another high-performance alternative for Ryobi 40V tool users with this 6.0Ah battery. It is engineered for extended runtime, allowing for long-lasting performance during demanding use. The product information includes a helpful note to let the battery cool down before recharging, which can contribute to its long-term health.
This battery is a perfect replacement for numerous original Ryobi part numbers and is compatible with all Ryobi 40V lithium-ion tools and chargers. Whether you need to power a string trimmer or a lawn mower, this battery is built to deliver the necessary energy. It represents a reliable aftermarket option for maximizing the uptime of your outdoor power equipment.
HART 40 Volts 4.0Ah Lithium-Ion Battery
This is the official battery for the HART 40V tool system, ensuring full compatibility and performance with all tools in the lineup. The advanced Lithium-Ion technology provides substantial power and a longer life without any “memory” effect, so you can recharge it at any time without reducing its capacity.
With a 4.0Ah capacity, it offers better runtime and power, which is particularly beneficial for more demanding tools like mowers and chainsaws. If you are invested in the HART ecosystem, this battery is the designated power source to keep your tools running efficiently and effectively for all your lawn and garden projects.
xiixtoo DCB406 Replacement 6.0Ah 40V Lithium-ion Battery
This battery from xiixtoo is designed as a replacement for DeWalt 40V lithium battery models like the DCB406. Its high 6.0Ah capacity makes it suitable for power-hungry DeWalt cordless tools, providing the endurance needed for longer jobs. It is built to be compatible with a range of DeWalt outdoor power equipment.
A useful built-in LED display and indicator allow you to intuitively monitor the battery’s status at a glance. This feature helps in planning your work by knowing exactly how much charge remains. For DeWalt 40V tool users looking for a high-capacity aftermarket battery, this product offers a feature-rich alternative.
EGO Power+ BA1400T 40V 5.0Ah ARC Lithium Battery
The EGO Power+ battery utilizes ARC Lithium technology, which is designed to provide increased power and longer runtime for demanding applications. With a 5.0Ah capacity, it strikes a strong balance between physical size and enduring power, making it an excellent choice for EGO lawn mowers and other tools.
As part of the EGO Power+ system, this battery is engineered to work seamlessly with all EGO 40V tools, delivering consistent performance. The brand is well-regarded in the cordless outdoor power equipment market for its innovation and reliability. For EGO tool owners, this battery is the key to unlocking the full potential of their equipment.
Buying Guide: How to Pick the Right 40 Volt Battery
So you’re in the market for a new 40 volt battery for your lawn mower. It can feel a bit overwhelming with all the options out there, but I can tell you from experience that focusing on a few key factors makes the decision much easier. The goal is to find a battery that not only fits your mower but also powers through your entire lawn without quitting on you.
First, let’s talk about Amp-Hours, or Ah. This is probably the most important spec. Think of the voltage as the power and the amp-hours as the fuel tank size. A 2.0 Ah battery is a small tank; it will get the job done for a smaller yard but might leave you stranded halfway through a larger one. A 4.0 Ah or 5.0 Ah battery is a much larger tank, giving you more runtime to finish the job. If you have a big property, investing in a higher Ah battery is a no-brainer.
Next up is compatibility. This seems obvious, but it’s crucial. A Greenworks battery won’t fit a Ryobi mower, and an EGO battery won’t work with a Kobalt tool. You are generally safest sticking with the same brand as your mower. However, some third-party manufacturers make excellent aftermarket batteries that are designed to be cross-compatible. Just be sure to double and triple-check the model number and physical fit before you buy.
You should also consider the battery’s build quality and features. Look for batteries with a built-in Charge State Indicator. Those little LED lights that show you how much juice is left are incredibly handy. It saves you from guessing and helps you plan your work. Also, pay attention to the battery’s chemistry. Almost all modern 40 volt batteries use Lithium-ion (Li-ion), which is great because they’re lightweight, hold a charge for a long time, and don’t have the “memory effect” that older battery types suffered from.
Finally, think about your future needs. If you own or plan to own other tools from the same brand—like a string trimmer, leaf blower, or chainsaw—a larger, more powerful battery is a fantastic investment. It becomes the central power source for your entire yard tool ecosystem. When you’re looking at the 10 best 40 volt batteries for lawn mowers for your needs, balancing runtime (Ah), brand compatibility, and extra features will lead you to the perfect choice for your grass-cutting duties.
Frequently Asked Questions
How long does a 40 volt lawn mower battery typically last?
This depends heavily on the battery’s Amp-hour (Ah) rating and your mowing conditions. On average, a 2.0 Ah battery might last 20-30 minutes, while a 5.0 Ah battery can often go for 60 minutes or more. Thick, wet grass will drain it faster than dry, short grass. Think of it like a phone battery; streaming video uses more power than reading an article.
Can I use a higher Ah battery in my 40 volt mower?
Yes, absolutely! As long as the voltage matches (40V) and the battery is physically compatible with your mower’s dock, using a higher Ah battery is a great idea. It’s like putting a larger gas tank in your car. The mower will run at the same power, but it will run for a longer time. You won’t damage your mower by using a battery with a higher Ah rating.
Is it okay to leave my battery on the charger after it’s full?
Most modern smart chargers are designed to prevent overcharging. Once the battery reaches 100%, the charger will typically switch to a maintenance or “trickle charge” mode. However, for the long-term health of the battery, it’s generally a good practice to unplug the charger once the battery is full. I usually make it part of my routine to take it off as soon as the indicator light turns green.
Why won’t my 40 volt battery hold a charge anymore?
This is usually a sign of the battery reaching the end of its life. All rechargeable batteries have a finite number of charge cycles. If it’s not lasting nearly as long as it used to, it’s probably time for a replacement. Extreme temperatures (both hot and cold) can also accelerate this aging process, so storing your battery in a cool, dry place is important.
Are aftermarket or generic 40 volt batteries safe to use?
This can be a bit of a gamble. Some aftermarket batteries are perfectly fine and offer great value. However, others may cut corners on safety features and quality control, which can be a fire risk or potentially damage your mower. If you go the aftermarket route, do your research. Read a lot of reviews and stick with reputable sellers. Often, the peace of mind that comes with a genuine OEM battery from the tool manufacturer is worth the extra cost when you are choosing from the list of the best 40 volt batteries for lawn mowers for your needs.