7 Best Ryobi Battery 40v 2025 in the United States

The Ryobi 40V 4.0 Ah Lithium-Ion Battery OP4040 is an excellent choice for users seeking reliability and performance in their outdoor cordless tools. With a 4.0Ah capacity, it provides impressive runtime, allowing you to work longer without constantly needing to recharge. This battery is specifically designed for compatibility with a range of Ryobi's 40V tool models, making it a versatile option for those already invested in the Ryobi ecosystem. Many users appreciate that it is lighter and offers better performance compared to traditional NiCD batteries, which can reduce fatigue during extended use, making it a user-friendly choice.

On the downside, this battery does not come with a charger, meaning you'll need to purchase a compatible charger separately if you don't already own one. Additionally, while its weight is a strength, some users may still find it a bit heavy after prolonged use, especially compared to smaller batteries. It's worth noting that while the battery has decent durability, warranties can vary, so checking the specific terms before purchase is advisable.

The Ryobi 40V OP4040 battery is a strong option for those needing a dependable power source for their Ryobi tools, but potential buyers should be aware of its compatibility requirements and the need for a separate charger.

The Futurebatt [2Pack] 6.0 Ah 40 Volt Battery is designed to be a high-capacity alternative for users of Ryobi 40V power tools. With a capacity of 6.0 Ah, this battery promises longer usage times between charges, which is a significant advantage for those needing extended power for tools like lawn mowers and string trimmers. Being lighter than the original equipment manufacturer (OEM) batteries is another plus, as it can make handling tools easier.

A major strength of this battery is its wide compatibility, fitting various Ryobi 40V tools and chargers. This ensures that users with multiple tools won’t need separate batteries, simplifying equipment management. The lithium-ion composition means it doesn’t suffer from memory effects, allowing charging without capacity loss, which is especially useful for frequent, long-term use.

The integrated charging indicator is a handy feature, providing clear signals on the charging status. Durability is highlighted with the ability to handle over 500 charge cycles. The product’s weight of 5.63 pounds is moderately heavy, which could affect tool balance and user fatigue depending on the application. Lastly, potential buyers should be mindful of its weight and verify warranty support details before purchasing.

The Ryobi 40V Battery and Charger Kit with a 4.0 Ah lithium-ion battery is a solid choice if you already use Ryobi 40V power tools or plan to build a collection around this battery system. The 4.0 Ah capacity offers a good amount of runtime, letting you work longer between charges, which is handy for tasks like yard work or home projects. The lithium-ion cells provide consistent power without fading out as the battery drains.

The kit includes a slim charger that’s compatible with all existing Ryobi 40V tools, making it easy to integrate into your setup. It weighs about 3.6 pounds, which is a reasonable balance between power and portability—it won’t feel too heavy when swapping batteries in your tools. An added convenience is the on-board LED indicator that shows how much charge is left, so you won’t be caught off guard.

The battery is designed to be durable, and Ryobi’s warranty adds peace of mind. Some users might find the battery weight a bit noticeable if using lightweight tools, but for most tasks, its performance justifies this. If you need a reliable battery pack that fits well within the Ryobi 40V ecosystem and offers solid runtime with fade-free power, this kit is a dependable option.