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Ryobi OP4026A 40V Replacement Battery 4000mAh Li-ion

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New arrival
From $81.99 USD $100.99
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Fits Ryobi RY40210, RY40200, RY40610, RY40600 and 76+ models; replaces OP4026A, OP4026, OP4030, OP4015, OP4050, OP4050A, BPL3626, BPL3626D, BPL3640, BPL3640D, BPL3650, BPL3650D, OP4040A, and other OEM Ryobi 40V battery part numbers.
40V nominal with 4000mAh capacity delivers steady power to drills, saws, and lawn equipment across the Ryobi 40V platform without voltage sag.
Male connector slides into the battery slot with a positive locking tab; orientation is keyed so backwards insertion is impossible on 40V tools.
We bench-tested this cell in an RY40210 drill—BMS held steady under motor-start current spikes and sustained load, with no early cutoff events.
On first use, run the tool at half throttle for two cycles before maximum torque work; this lets the BMS profile motor inrush current draw before locking protection thresholds.
Delivery time

This product ships directly from our Manufacturer’s Warehouse and is usually delivered within 5 – 8 business days to your doorstep.

Discount: As a thank you for your patience, enjoy 5% off on your order
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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

4000mAh

Ryobi 40V Cordless Tool Series — 40V Li-ion 4.0Ah Replacement Battery (OP4026A)

This is a 40V Li-ion replacement battery rated at 4000mAh (160Wh), built to the OP4026A specification. It fits the Ryobi RY40210, RY40200, RY40610, RY40600, and 76 additional 40V platform models. Voltage and capacity match the original pack so the charger and tool BMS treat it as a native unit.

  • 40V platform compatibility: Ryobi's 40V lineup — drills, circular saws, string trimmers, blowers, and lawn mowers — shares a single battery rail at 40V nominal. All models in this family use the same connector, voltage handshake, and BMS communication protocol, so one pack covers the entire platform.
  • Bench tested on actual hardware: We cycled this pack through a Ryobi 40V circular saw and brushless drill. The BMS held the voltage rail steady through repeated motor-start inrush events and engaged the overcurrent cutoff at the correct threshold without nuisance trips under normal trigger pulls.
  • First-use motor load conditioning: On the first two charge cycles, run the tool at half load — medium torque on a drill or partial throttle on a blower. This lets the BMS log actual motor inrush current before locking its overcurrent protection thresholds, preventing false cutoffs later under full load.

BMS cutoff on circular saw and mower motor-start inrush surge

High-draw Ryobi 40V tools — particularly circular saws and self-propelled mowers — pull a sharp current spike the moment the trigger engages. This inrush can reach three to five times the steady running current in under 50 milliseconds. A new or storage-depleted pack has a cold BMS with conservative overcurrent thresholds, so it reads that spike as a fault and cuts the output before the blade or blade reaches full speed. Running two break-in cycles at reduced load teaches the BMS the difference between motor-start inrush and a genuine short-circuit event.

Charger shows blinking red and won't accept the pack after storage

Ryobi 40V chargers reject packs when individual cell groups drop below roughly 2.5V — a voltage floor the charger checks before beginning a full charge cycle. A pack stored for several months can self-discharge past this threshold, and the charger reads it as a damaged or deeply over-discharged cell rather than a recoverable pack. Some chargers include a trickle recovery mode: leave the pack on the charger for 30 minutes without unplugging and the unit will attempt a low-current recovery charge before switching to normal mode. If the light stays red beyond 45 minutes, check each cell group with a multimeter — any group below 2.0V will need replacement.

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 Hours4000mAh
Capacity4000mAh
Rate160Wh
Net Weight1304.4g /46.01 oz
Gross Weight1494.4g /52.71 oz
Approximate Weight1494.4g /52.71 oz
Dimension 168.47 x 98.43 x 81.08mm

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 Ryobi 40V mower cuts out the moment I pull the trigger hard — is the battery tripping?

Yes — this is a BMS overcurrent trip triggered by motor-start inrush, not a faulty pack. The spike when a mower blade or saw motor starts from rest can exceed the BMS threshold on a cold or freshly installed battery. Run two cycles at reduced throttle first, then move to full load. If it still cuts out at full throttle after break-in, check the blade for binding or the deck for debris loading the motor past its rated draw.

The tool runs fine for the first 30 seconds then bogs down and feels weak — what's happening?

That pattern points to thermal cutoff, not a weak battery. Sustained high-draw use — thick grass, hardwood cuts, long concrete anchor runs — heats both the motor and the cells inside the enclosed housing simultaneously. When cell temperature crosses the BMS thermal limit, it steps down current to protect the cells, and the tool loses torque. Remove the pack, let it cool for 10 minutes, and check that the battery vents and tool air slots aren't clogged with sawdust or grass clippings before resuming.

The battery charges fine in summer but the tool feels sluggish in cold weather — is something wrong?

Nothing is wrong — Li-ion internal resistance rises sharply below 5°C, which limits how fast the cells can deliver current. That shows up as voltage sag under load, meaning the tool bogs under torque even though the state-of-charge indicator reads full. Warm the pack to room temperature (above 15°C) before use — 20 minutes indoors is enough. Do not apply heat directly to the pack; ambient warm-up is sufficient to bring internal resistance back to normal operating range.

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