40 Volt Lithium-Ion 6.0 Ah Battery Replacement for Ryobi 40V Battery OP40602 Compatible with Ryobi 40V Tools and Chargers, 2-Pack

What It Is

This is a 40-volt, 6.0 amp-hour lithium-ion battery replacement for Ryobi 40V cordless lawn mowers, string trimmers, blowers, and other outdoor tools. The two-pack provides extended runtime for medium to large yards without needing to recharge mid-job.

Fitment & Compatibility

• Model compatibility: Replaces Ryobi OP40602, OP40601, and works with all Ryobi 40V tools and chargers (e.g., P108, P109, P110 chargers). Not compatible with Ryobi 18V or 36V systems.
• Physical fit: Same dimensions as OEM 4.0Ah/5.0Ah batteries; fits all current Ryobi 40V platforms, including mowers with rear-mounted battery trays. Will not fit older 40V mowers with side-mounted battery compartments (check your deck’s battery slot orientation).
• Aftermarket vs. OEM: This is a third-party replacement, not Ryobi-branded. It uses generic cells; performance and lifespan may vary from OEM. Verify your charger’s voltage output (40V only) before use.
• Measurement check: Battery measures approximately 5.5 x 3.5 x 4.5 inches (LxWxH). Weighs about 2.5 lbs each. Confirm your tool’s battery cavity depth (some older mowers have tighter slots).

Key Things to Know

• Installation: No tools required. Slide battery into tool until it clicks; press release tab to remove. Charge with any Ryobi 40V charger—full charge takes 2-3 hours.
• Quality: 4.3-star average from 38 reviews suggests decent reliability, but some users report shorter lifespan than OEM after 6-12 months of heavy use. Cells may degrade faster in extreme heat (over 100°F).
• Common gotcha: This battery may not power high-draw tools (e.g., 40V chainsaws or brush cutters) as efficiently as OEM—expect slightly reduced torque under load. Also, the plastic housing can be slightly less durable than Ryobi’s; avoid dropping.
• Warranty: Typically 1-2 years from the seller—check listing details. No Ryobi factory warranty applies.

Should You Buy It

Buy this two-pack if you have multiple Ryobi 40V tools, need extra runtime for a large lawn, and want to save money over OEM. Skip it if you rely on a single high-draw tool (like a mower on thick grass) or need maximum reliability—OEM Ryobi batteries (OP40602) are more consistent and better supported.