2-Pack 6.0Ah Replacement for Ryobi 40V Battery & OP401 Charger Kit, 40 Volt Lithium Ion Battery Compatible with OP4026 OP40261 OP4050 OP4040 OP40401 OP40601 OP40201 RY40180 (3-Pack)

What It Is

A 2-pack of 6.0Ah aftermarket lithium-ion batteries for Ryobi 40V outdoor power equipment (mowers, trimmers, blowers, chainsaws). Designed to replace OEM Ryobi batteries and work with the OP401 charger kit and similar chargers.

Fitment & Compatibility

Check these before buying:

• Voltage & platform: Must be a Ryobi 40V tool—this won’t fit 18V or 24V Ryobi systems. Look for “40V” on your tool or existing battery.
• Model numbers: Compatible with OP4026, OP40261, OP4050, OP4040, OP40401, OP40601, OP40201, RY40180. If your battery or charger is one of these, it fits.
• Physical fit: The battery uses the standard Ryobi 40V slide-on interface. It fits all Ryobi 40V tools that accept the tall, rectangular battery pack (not the older flat style).
• Charger compatibility: Works with OP401, OP406, OP408, and most Ryobi 40V chargers. Not compatible with the OP403 or OP404 dual-port chargers without testing.

Key Things to Know

• Not OEM: This is an aftermarket battery. Capacity (6.0Ah) is higher than Ryobi’s standard 4.0Ah or 5.0Ah packs, so runtime may be better, but quality control and cell longevity vary. Check reviews for swelling or premature failure.
• Installation: Zero difficulty—slides on and locks like original. No tools or modifications needed.
• Charging time: Expect 2–4 hours on a standard charger. The higher capacity takes longer than a 4.0Ah pack.
• Common gotcha: Some users report the battery doesn’t fully seat on older Ryobi tools with tight battery trays. Test fit before using on a mower with a sealed deck.

Should You Buy It

Buy this if you need extra runtime for a Ryobi 40V mower or trimmer, want a lower-cost alternative to OEM (about half the price of a 6.0Ah Ryobi branded pack), and are comfortable with aftermarket risk. Skip it if you need guaranteed longevity, warranty support, or perfect fit on older tools; stick with genuine Ryobi batteries for those cases.