1Pack 7.5Ah OP4026 Replacement for Ryobi 40V Battery Compatible with Ryobi 40 Volt Lithium Battery OP40201 OP4040 OP40404 (7.5Amps-1PC)

What It Is

This is a 7.5Ah aftermarket lithium-ion battery designed to replace the Ryobi OP4026, powering any Ryobi 40V cordless lawn mower, trimmer, blower, or other 40V outdoor tool. It provides a higher capacity than the standard 4Ah or 5Ah packs for longer run time.

Fitment & Compatibility

• Works with: All Ryobi 40V tools and chargers that accept the standard “slide-on” battery mount (not the older “push-in” style).
• OEM cross-reference: Replaces Ryobi OP40201, OP4040, OP40404, and OP4026. Also compatible with Ryobi 40V mowers like the RY40190, RY40180, RY401160, and most 40V string trimmers, blowers, and chainsaws.
• What to check before buying: Measure your current battery’s dimensions (approx. 5.5" x 3.5" x 4.5”) and ensure the slide rails on the battery match your tool’s connector. This battery will not fit older 18V or 36V Ryobi tools. Verify your charger is 40V compatible (most Ryobi 40V chargers are).
• Physical fit: The 7.5Ah pack is slightly taller than a 4Ah battery; confirm your mower’s battery compartment has enough clearance (common on newer mowers, but tight on some older models).

Key Things to Know

• Quality: Aftermarket, not OEM. Expect similar performance to a genuine Ryobi 7.5Ah pack but with slightly lower build quality and no official warranty from Ryobi.
• Installation: Zero difficulty—slides on and off like any Ryobi battery. No wiring or tools needed.
• Common gotcha: This 7.5Ah battery may be heavier (~2.5 lbs) than a 4Ah pack, which can affect balance on handheld tools like trimmers. Also, some users report the charge indicator lights are less accurate than OEM.
• Charging: Works with any Ryobi 40V charger (the standard OP4040 charger will charge it in about 2 hours). Do not use with 18V chargers.

Should You Buy It

Buy this if you want a low-cost, high-capacity spare for your Ryobi 40V lawn mower or other tools and don’t mind an aftermarket battery that may lack the longevity or warranty of the genuine Ryobi pack. It’s a solid budget option for light-to-moderate use, but if you rely on your mower daily or need maximum reliability, stick with OEM.