2 Packs 8Ah 40 Volt OP40601 Battery Replacement for Ryobi 40V Battery OP40401 OP40404 Compatible with Ryobi 40V Lithium Battery OP40602 OP4060A OP4040 OP4050 OP40501(Green)

What It Is

This is a two-pack of 8Ah aftermarket batteries designed to replace the Ryobi 40V lithium battery series. They’re intended for use in Ryobi 40V cordless lawn mowers, string trimmers, blowers, chainsaws, and other outdoor power equipment that takes the standard Ryobi 40V slide-in battery platform.

Fitment & Compatibility

Before buying, confirm your tool uses the Ryobi 40V slide-in battery system—not the older 18V or the newer 40V brushless platform with a different connector. This battery replaces OEM models OP40401, OP40404, OP40601, OP40602, OP4060A, OP4040, OP4050, and OP40501. It fits most Ryobi 40V mowers (e.g., RY40180, RY40190), but check your mower’s battery compartment for physical clearance—some older models have tight slots that may not accommodate the slightly wider aftermarket casing. Measure the battery slot width (typically 2.5–3 inches) and compare to the listed dimensions. Not compatible with Ryobi 40V riding mowers or tools that require a “+” or “HP” battery designation.

Key Things to Know

• Quality vs. OEM: These are aftermarket cells, not Ryobi-branded. Expect slightly lower run time and cycle life compared to genuine OP40601 batteries, but they’re fine for casual use.
• Installation: No tools needed—slide in until it clicks. If it doesn’t lock, check the latch alignment; some aftermarket batteries have slightly thicker tabs that may need gentle filing.
• Charging: Works with any Ryobi 40V charger (standard or rapid). Charging time is about 2–3 hours from empty. Do not mix old and new batteries in a mower that uses two—charge both fully before use.
• Common Gotcha: The green plastic shell may feel cheaper than OEM. If your mower vibrates heavily, the battery can rattle loose—secure it with a zip tie if needed.

Should You Buy It

This two-pack is a solid value for homeowners who need spare batteries for light to moderate yard work and don’t want to pay Ryobi’s premium. It’s right for you if you have multiple 40V tools and want to keep one charged while using the other, or if your original battery is dying and you’re on a budget. Skip it if you rely on your mower for large lawns (over 1/2 acre) and need maximum runtime and durability—stick with OEM for that.