40V 6Ah Lithium Battery: Replacement for Ryobi 40 V Battery OP40401 OP40602 OP4026 OP40501 OP40261 Compatible with Ryobi 40 Volt Lawn Mower 6.0 Ah 2 Pack

What It Is

This is a 40V 6.0Ah lithium-ion battery pack, sold as a two-pack, designed to power Ryobi 40V cordless lawn mowers, trimmers, blowers, and other outdoor tools. It’s a replacement for OEM Ryobi batteries, intended for users needing extended runtime for medium-to-large yards without stopping to recharge.

Fitment & Compatibility

Before buying, confirm your tool uses a Ryobi 40V platform (not 18V or 36V). This battery is compatible with Ryobi models using OP40401, OP40602, OP4026, OP40501, or OP40261. It fits most Ryobi 40V lawn mowers (e.g., RY40180, RY40190, RY401140), but check your mower’s battery compartment dimensions—aftermarket batteries can be slightly thicker, causing fit issues in tight slots. Measure your OEM battery: this pack is roughly 5.5 x 3.5 x 4.5 inches. Also verify your charger is 40V (not 18V); it will work with Ryobi 40V chargers, but charging time may be longer with lower-amp chargers.

Key Things to Know

• Runtime vs. OEM: At 6.0Ah, this pack provides about 25–35% more runtime than Ryobi’s standard 4.0Ah battery on a mower, but aftermarket cells may degrade faster over time.
• Installation: Drop-in replacement—no tools or wiring needed. Just slide into the battery slot until it clicks.
• Quality concerns: With a 3.7-star rating and 24 reviews, some users report shorter lifespan or inconsistent charge levels compared to genuine Ryobi. Check return policy for defects.
• Weight: At ~2.5 lbs per battery, two packs add noticeable weight to handheld tools; fine for mowers but may fatigue arms on trimmers.

Should You Buy It

Buy this if you need a budget-friendly two-pack for a Ryobi 40V mower or trimmer and want extra runtime without paying for OEM prices. Skip it if you prioritize long-term reliability, warranty support, or have a tight battery compartment—stick with genuine Ryobi batteries for peace of mind.