Ryobi 2Ah 40V Lithium-Ion Compact Battery (OP40201)

What It Is

The Ryobi 2Ah 40V Lithium-Ion Compact Battery (OP40201) is a lightweight, 40-volt power source designed for Ryobi’s 40V line of cordless lawn mowers, string trimmers, blowers, and other outdoor tools. Its compact size makes it ideal for lighter tasks or as a backup battery for smaller mowers and handheld equipment.

Fitment & Compatibility

Before buying, verify your tool uses the Ryobi 40V platform (not the 18V One+ system). This battery fits all Ryobi 40V tools, including push mowers (e.g., RY40180, RY401140), but not riding mowers or older 36V models. Check your mower’s battery compartment dimensions: the OP40201 measures 5.1 x 3.5 x 4.7 inches and weighs 1.3 lbs. For mowers requiring higher runtime (e.g., 6-7Ah batteries), this 2Ah pack may not fit physically or provide enough power for a full cut. Always confirm your tool’s voltage (40V) and battery type (lithium-ion, not NiCd). OEM part; aftermarket alternatives may lack safety certifications.

Key Things to Know

• Runtime: Expect ~15-20 minutes of mowing on a 40V push mower (e.g., 16-inch deck) or ~30-40 minutes on a string trimmer—sufficient for small yards (under 1/4 acre) or spot trimming.
• Installation: Tool-free snap-in design; slides into the battery port until it clicks. No wiring or tools needed.
• Common gotchas: Not compatible with Ryobi’s 18V or 36V systems. Avoid using with high-drain tools like snow blowers or large mowers—may trigger low-battery shutdown quickly. Charge only with Ryobi 40V chargers (model OP405A or similar) to prevent damage.
• Quality: Ryobi OEM battery with built-in LED charge indicator and overheat protection. Some users report reduced capacity after 1-2 years of heavy use.

Should You Buy It

Buy this if you need a lightweight, affordable spare for small 40V tools or have a compact mower for a tiny lawn. Skip it for large yards (over 1/4 acre) or high-power jobs—opt for a 4Ah or 6Ah battery instead.