TREE.NB Ultra-High Capacity 7.5Ah Replacement for Ryobi 40V Battery Upgraded Compatible with 40Volt Ryobi Lithium Battery OP4040 OP40401 OP4050 OP4060A OP40601

What It Is

This is a 40V, 7.5Ah aftermarket replacement battery for Ryobi 40V cordless lawn mowers, string trimmers, blowers, and other outdoor power equipment. It offers a high capacity (7.5Ah) for longer runtime on larger mowers or heavy-use tools.

Fitment & Compatibility

Check your Ryobi tool’s battery port shape. This battery fits all Ryobi 40V brushless and standard tools that accept the original OP4040, OP40401, OP4050, OP4060A, or OP40601 batteries. It will not fit Ryobi 18V or 24V tools. Measure your original battery’s length and width (approx. 6.5 x 3.5 x 4.5 inches) to confirm it fits your tool’s battery bay. Works with Ryobi 40V chargers (e.g., OP404C, OP408C, OP406C). Not compatible with Ryobi 40V “Expand-It” or “Link” system batteries.

Key Things to Know

• Higher capacity = longer runtime. 7.5Ah vs. standard 4.0Ah or 5.0Ah means 50–90% more run time per charge on a 40V mower.
• Aftermarket build. Not made by Ryobi; may have slightly different casing dimensions or latch feel. Check that the battery clicks in securely.
• No fuel gauge. Some aftermarket 40V batteries lack the LED charge indicator found on OEM Ryobi batteries. Verify if this matters to you.
• Warranty risk. Using a non-OEM battery may void your tool’s warranty. Ryobi tools are not covered for damage from third-party batteries.

Should You Buy It

If you need extended runtime for a large lawn (over ½ acre) or heavy trimming, and you’re comfortable with an aftermarket battery, this is a cost-effective upgrade over a smaller OEM pack. However, if you want guaranteed fit, warranty protection, and a fuel gauge, stick with an official Ryobi 40V 6.0Ah or 7.5Ah battery.