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Ryobi OP4026A 40V Replacement Battery 3000mAh Li-ion

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New arrival
From $141.99 USD $174.99
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Fits Ryobi RY40210, RY40200, RY40610, RY40600 and 76 additional 40V cordless mowers and tools; replaces OP4026A, OP4026, OP4030, OP4015, OP4050, OP4050A, BPL3626, BPL3626D, BPL3640, BPL3640D, BPL3650, BPL3650D and all listed variants.
40V, 3000mAh lithium-ion delivers stable voltage across the mowing cycle; 120Wh capacity keeps the RY40210 cutting residential lawn sections on a single charge without mid-cut power sag.
Slide-latch connector seats into the RY40210 battery slot with a firm click; flat rectangular profile matches the OEM housing geometry without rotation or side play.
We bench-tested this pack on the RY40210 motor startup and sustained load — the BMS triggered no early cutoff during trigger pull inrush or full-deck engagement under typical grass load.
On first use with the RY40210, run the mower at half throttle for two passes before full-speed cutting — allows the BMS to learn the motor inrush signature before locking overcurrent protection.
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Battery Care Tips

🔹 Getting Started

Charge your new battery fully before you use it for the first time. Over the next few charge cycles, run your device down to around 20% before you recharge—this helps the battery perform its best. After that, charge whenever you need to.

🔹 Keep It Healthy

Avoid letting your battery completely drain or staying plugged in constantly. Both extremes wear it out faster. Store the battery in a cool, dry place when you're not using it, since heat damages batteries quickly.

Delivery and Shipping

🔹 Most orders ship the next day, and we use FedEx, UPS, Purolator and other carriers to get them to you. Lithium batteries have to ship by ground only, not air or USPS. Make sure your address is right before you order, because if we have to send it back, you pay for shipping again.

Disclaimer

⚠️ Disclaimer: All product names, trademarks, and registered trademarks belong to their respective owners.

🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.

Voltage

40V

Amp

3000mAh

Ryobi 40V Series Lawn Mower — 40V Li-ion Replacement Battery (OP4026A)

This is a 40V Li-ion replacement battery pack rated at 3000mAh, built to the OP4026A specification. It fits the Ryobi RY40210 cordless lawn mower and a wide range of other Ryobi 40V outdoor power tools. The connector, voltage rail, and BMS handshake protocol match the original Ryobi 40V platform.

  • Ryobi 40V platform compatibility: The RY40210, RY40200, RY40610, RY40600, and 76+ additional Ryobi 40V tools share the same battery interface — same connector housing, same 40V nominal rail, and the same BMS communication protocol. One pack moves across the entire lineup without adapter changes.
  • Bench tested on actual hardware: We ran this pack through full charge and discharge cycles on the Ryobi 40V platform. The BMS correctly flagged overcurrent on simulated motor-start inrush and recovered cleanly. Cell balancing completed within expected charge window at 40V cutoff.
  • Mower-specific break-in tip: On first use, mow at a steady pace through light grass for two passes before cutting thick or wet turf. This lets the BMS log the mower motor's inrush current signature and set its overcurrent threshold accurately before you hit peak load.

BMS cutoff on mower blade motor-start inrush

When the RY40210 blade motor spins up from a dead stop, it draws a current spike that can be three to five times the steady-state running current. A new pack's BMS has not yet profiled this motor's inrush pattern, so its overcurrent threshold may be set conservatively. This causes the pack to cut out immediately at blade engagement — not a faulty battery, but an unlearned profile. Two or three partial-load start cycles allow the BMS to log the inrush curve and widen the threshold to match the actual motor draw.

Charger flashing red and refusing to accept a new pack from storage

Li-ion packs stored for extended periods can drop below the charger's acceptance voltage — typically around 2.5V per cell. The Ryobi 40V charger interprets this as a fault condition and flashes red rather than beginning a charge cycle. The fix is a brief trickle recovery: place the pack on the charger, wait 10–15 minutes, then remove and re-seat it firmly. If the charger still rejects the pack after two attempts, check that the terminal contacts on both the pack and charger port are clean and seated flush — dirty contacts cause the same symptom as undervoltage.

Compatible Models

RY40210 RY40200 RY40610 RY40600 RY40510 RY40500 RY40410 RY40400 RY40110 RY40100 RY40112 RY40500A RY40220 RY40204 RY40511 RY40002 RY40601 RY40190 RY40190-Y RY40180 RY40180-Y 40V Lithium BRUSHLESS 40-Volt Brushless Lithium-Ion Cordless ElectricLawn Mower 40V Backpack Blower 625 CFM RY40440 40V VAC ATTACK Leaf Mulcher RY40450 RY40460 40V 500 CFM Jet Fan 500 CFM RY40530 40V 14 IN Brushless Chain Saw 40V 20 IN BRUSHLESS RY40201A RY40202 RY40250 RY40402A/ R40402 RY40403 RY40403A RY40411 RY40430 RY40502A RY40601A RY40502 R40402 RBC3600E RBC3626E RBC36X20B RBC36X26B RBL3600 RBL3600J RBL3626 RBL36B RBL36JB RBV36B RCS36 RCS36B RCS36X3550HI RED3600 RED3626 RHT3600 RHT3625 RHT36C5525 RHT36C60R15 RLM3600L RLM3640L RLM36X40H RLM36X40H40 RLM36X40H50 RLM36X46H5P RLM36X46L50HI RLT3600C RLT3625C RLT36B33 RLT36C3325 RLTHTB36 RPP3600 RPP3626 RY40402A

Replaces Part Numbers

OP4026A OP4026 OP4030 OP4015 OP4050 OP4050A BPL3626 BPL3626D BPL3640 BPL3640D BPL3650 BPL3650D OP4040A OP40201 OP40261 OP40301OP4040 OP40401 OP40501 OP40601 OP40602 OP40301 OP4040

Technical Specifications

Voltage40V
Amp Hours3000mAh
Capacity3000mAh
Rate120Wh
Net Weight1270.3g /44.81 oz
Gross Weight1460.3g /51.51 oz
Approximate Weight1460.3g /51.51 oz
Dimension 167.13 x 98.26 x 80.77mm

Product Highlights

  • Brand: Ryobi
  • Manufacturer: CS
  • Series: Standard
  • Color: Grey
  • Product Type: Li-ion
  • Battery Type: Li-ion
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

My RY40210 blade cuts out the instant I engage it — does this battery trip on startup?

Yes, and it is a BMS overcurrent response to the blade motor's inrush spike on startup, not a defective pack. A new battery has not yet logged the mower motor's current signature, so its overcurrent threshold starts conservative. Run the mower through two or three light-grass cycles at steady pace — this lets the BMS profile the inrush curve and raise its cutoff threshold to match the motor. After those break-in passes, blade engagement cutout stops.

The mower runs but bogs badly and feels like it has no power under thick grass — is the battery draining too fast?

That is voltage sag, not capacity loss. Under sustained heavy load — thick or wet turf — the cell stack can't maintain the full 40V rail, and the mower's motor controller responds by reducing output. First, check that the battery contacts and tool port are clean and making full contact, because high rail resistance amplifies sag. If contacts are clean and the problem persists, avoid cutting wet grass with this pack size — 3000mAh at 40V handles typical residential dry turf, but dense wet loads push the cells into sustained high-current draw that drops rail voltage below the tool's regulation threshold.

The battery performs fine in summer but the mower feels noticeably weaker in cold mornings — is that normal?

It is. Li-ion internal resistance rises sharply below 5°C, which reduces the current the cells can deliver without voltage sagging. The RY40210's motor controller sees lower rail voltage and throttles output accordingly. Store the pack indoors overnight so it starts at room temperature before use — a pack that begins a cold-morning mow at 20°C instead of 4°C will hold its 40V rail under load considerably better. Do not charge the pack if it has been sitting in freezing temperatures; bring it above 10°C first.

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