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

What It Is

This is a 6Ah 40V lithium-ion battery replacement for Ryobi 40V cordless lawn mowers, trimmers, blowers, and other outdoor power tools. It provides extended runtime compared to standard 4Ah or 5Ah packs, ideal for larger yards or heavy-use jobs.

Fitment & Compatibility

Before buying, confirm your tool uses a 40V Ryobi slide-on battery (not the older 18V or 24V platform). This battery is compatible with all Ryobi 40V tools that accept OP40401, OP40602, OP4026, OP40501, or OP40261 packs. Works on most Ryobi 40V mowers (e.g., RY40180, RY40190, RY401140) but check your mower’s battery compartment dimensions—some older or compact models may have tight fitment. This is an aftermarket replacement, not OEM, so verify voltage and connector shape match your original battery. Do not use on 18V or 36V systems.

Key Things to Know

• Runtime vs weight: 6Ah offers 20–30% more run time than a standard 4Ah but adds noticeable weight. Expect ~45–60 minutes on a push mower under normal conditions.
• Installation: No tools needed—slide onto the battery port until it clicks. Ensure the release button engages fully.
• Charging: Use only a Ryobi 40V charger (OP4040, OP4060, etc.). Aftermarket chargers may cause poor performance or safety issues. Full charge time ~2–3 hours.
• Common gotchas: Battery may sit slightly taller than OEM, so check clearance under mower covers. Not compatible with Ryobi 40V “expand-it” attachments that use a different connector. Do not store fully discharged.

Should You Buy It

Buy this if you need a reliable, high-capacity spare for your Ryobi 40V mower or trimmer and want to save over OEM pricing. It’s a solid choice for medium-to-large lawns (¼–½ acre) where extra runtime matters, but skip it if you require exact OEM fitment for tight battery compartments or prefer the lightweight of a 4Ah pack.