KUNLUN 40V 6.0Ah Battery for Ryobi 40V Battery, High Capacity 40-Volt Lithium Battery for RYOBI OP4040 OP40201OP4026 OP4030 OP4050 OP4050A OP4060 OP40601 OP40602 OP4060A OP4075A

What It Is

This is a high-capacity 40V 6.0Ah lithium replacement battery designed for Ryobi 40V cordless lawn mowers, trimmers, blowers, and other outdoor power equipment. It provides longer runtime than standard 4.0Ah or 5.0Ah packs, ideal for larger yards or heavy-duty tasks.

Fitment & Compatibility

Before buying, confirm your device uses the Ryobi 40V ONE+ battery platform (all Ryobi 40V tools share this interface). This aftermarket battery is listed as compatible with models: OP4040, OP40201, OP4026, OP4030, OP4050, OP4050A, OP4060, OP40601, OP40602, OP4060A, OP4075A. It will also fit any Ryobi 40V tool that accepts the standard slide-on battery. Not compatible with 18V ONE+ or older 40V models that use a different connector (e.g., pre-2015 blue-top packs). Measure your existing battery bay: this pack is slightly larger than a 4.0Ah due to higher capacity, so check clearance in tight compartments—especially on older mower decks.

Key Things to Know

• Build quality varies – Some users report the plastic latch feels less robust than OEM. Handle with care when inserting/removing.
• No fuel gauge – Unlike genuine Ryobi packs, this battery lacks an LED charge indicator. You’ll need to test it in the tool or charger to check level.
• Charger compatibility – Works with standard Ryobi 40V chargers (OP401, OP406A, etc.), but charge time may be longer (up to 4–5 hours) on slower models. Use a rapid charger for best results.
• Performance – Delivers advertised 6.0Ah capacity in moderate use, but some users note voltage drop under heavy load (e.g., thick grass or high-speed blower). Expect slightly shorter lifespan than OEM.

Should You Buy It

Buy this if you need a cost-effective spare or extended runtime for your Ryobi 40V tools and can accept the lack of a fuel gauge and occasional fitment quirks. Skip it if you prioritize OEM reliability, a charge indicator, or guaranteed performance in demanding conditions—stick with genuine Ryobi or a premium aftermarket option.