2Pack 7.5Ah OP40601 Replacement for Ryobi 40V Battery Compatible with Ryobi 40 Volt Battery Lithium OP4040 OP40401 OP4026 OP40261 OP4050 OP40201 Compatible with 40V Battery Power Tools (Green-3PC)

What It Is

This is a 2-pack of 7.5Ah aftermarket lithium batteries designed to replace Ryobi’s OP40601 and other 40V platform batteries. It’s meant for Ryobi 40V cordless lawn mowers, trimmers, blowers, chainsaws, and other 40V power tools—giving you extended runtime and backup power for larger yards or multiple tools.

Fitment & Compatibility

• Direct replacement for: Ryobi OP40601, OP4040, OP40401, OP4026, OP40261, OP4050, OP40201, and most 40V Ryobi tools.
• Check before buying: Confirm your tool uses the Ryobi 40V slide-on battery platform (not the older 18V or 36V). Measure the battery compartment depth—this 7.5Ah pack is physically larger than 4Ah or 5Ah units; it may not fit under some mower decks or in tight tool housings.
• OEM vs aftermarket: This is a third-party battery. It is not made by Ryobi. It will work in Ryobi 40V tools but may not charge in Ryobi’s rapid chargers designed for high-capacity packs—test with your existing charger first.

Key Things to Know

• Quality & safety: Aftermarket lithium packs can vary. Look for built-in BMS (battery management system) protection against overcharge, over-discharge, and short circuits. This listing mentions “smart BMS,” but verify in reviews.
• Installation difficulty: Zero—slide on, click, and go. No tools or wiring needed.
• Common gotchas: The 7.5Ah capacity means longer runtime but also longer charge time (4–6 hours on standard Ryobi 40V chargers). Some users report the green housing is slightly thicker than OEM, making it snug in certain tool slots. Also, these may not fit in Ryobi’s 40V backpack or dual-battery adapters.
• Warranty & support: Aftermarket batteries typically have 1-year warranty vs Ryobi’s 3-year. Keep your original OEM pack for warranty claims on the tool itself.

Should You Buy It

If you have a Ryobi 40V mower or trimmer and want a budget-friendly backup battery set for larger lawns (1/2 acre or more), this 2-pack is a solid value. But if you need maximum reliability, fast charging, or compatibility with Ryobi’s latest rapid chargers, stick with genuine Ryobi batteries.