2 Pack 6.5Ah High Capacity 40V Replacement Battery for Ryobi OP40605 OP4060A OP4040 OP4050, Compatible with Ryobi 40 Volt Tools

What It Is

This is a 2-pack of 6.5Ah high-capacity 40V replacement batteries for Ryobi 40-volt cordless lawn mowers and outdoor tools, designed to replace OEM models OP40605, OP4060A, OP4040, and OP4050. It provides extended runtime for mowing, trimming, blowing, and other yard work.

Fitment & Compatibility

• Tool voltage: Must be 40V Ryobi tools (not 18V or 36V). Check tool label.
• OEM replacements: Compatible with Ryobi models OP40605, OP4060A, OP4040, OP4050, and many others. Not guaranteed for newer Ryobi 40V+ series or tools with proprietary battery locks.
• Physical fit: Measure battery compartment depth and width before buying. These are slightly larger than standard 4Ah packs; may not fit tight slots on some string trimmers or blowers.
• Mower deck size: Fits any 40V Ryobi mower (e.g., 16-21 inch decks) but ensure battery bay has enough clearance for the taller 6.5Ah housing.
• Brand note: Aftermarket, not OEM. Warranty and performance may vary from genuine Ryobi batteries.

Key Things to Know

• Installation: No tools required – slide into tool battery port until it clicks. Ensure contacts are clean before use.
• Charging: Works with all Ryobi 40V chargers (standard and rapid). Full charge time roughly 2-3 hours.
• Quality & safety: Aftermarket cells may have less consistent voltage cutoffs and shorter total lifespan than OEM. Look for overcharge/over-discharge protection in the listing.
• Common gotcha: Some Ryobi tools (especially older models) may not recognize aftermarket batteries and will flash a red light or refuse to run. Test immediately upon arrival.

Should You Buy It

Buy if you need affordable extended runtime for high-drain Ryobi 40V tools like mowers or blowers, and you’re comfortable with aftermarket compatibility risks. Skip if you want guaranteed fit, warranty, or use with newer Ryobi tools that may reject third-party batteries.