The Ryobi battery 40V system is known for its versatility, but many users still ask — is it really cross-compatible with all 40V tools? The short answer is yes — Ryobi has designed their 40V batteries to work across the entire lineup of 40V tools, including lawnmowers, trimmers, chainsaws, and blowers. However, it's important to ensure you're not mixing 40V and 18V platforms, as they are not interchangeable. Always check the label — “Ryobi 40V” tools require “Ryobi 40V” batteries only. Some older models might have slight fitment issues, but most current tools and batteries from Ryobi follow the same One+ 40V standard. Also, keep in mind that third-party batteries claiming 40V compatibility can sometimes void warranties or cause charging issues. To stay safe and get optimal performance, it's best to use genuine Ryobi batteries and chargers.