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40V GreenWorks Chainsaw Replacement Battery 5000mAh

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From $162.99 USD $185.99
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Fits GreenWorks 40V 12" Chainsaw models GWG40B2 and GWG40B4 battery slots.
40V nominal voltage delivers 200Wh capacity for sustained cutting pressure on limbs.
Connector type XT60 with positive-first orientation locks into the chainsaw battery contact block.
We ran load tests under sustained bar engagement; BMS held voltage flat until final twenty percent.
Store at 3.7V per cell when idle longer than two weeks to preserve pack longevity.
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⚠️ This item is available by SPECIAL ORDER. Delivery for this product typically takes 2–3 weeks.

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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.

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⚠️ 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

5000mAh

GreenWorks 40V Chainsaw & Pole Saw — 40V Li-ion Replacement Battery

A 40V, 5000mAh (200Wh) lithium-ion battery built to fit GreenWorks 40V outdoor power equipment, including the 12" Chainsaw and 8" Cordless Pole Saw. Replaces part numbers GWG40B2 and GWG40B4. Slots into the same 40V platform that powers over 75 GreenWorks tools.

  • Broad 40V platform compatibility: GreenWorks standardized the connector, voltage rail, and BMS handshake across the 40V lineup, so one battery covers chainsaws, pole saws, and dozens of other tools sharing the same platform.
  • Bench tested on actual hardware: We ran full charge/discharge cycles — the BMS held voltage steady under cutting load and tripped cleanly at the low-voltage cutoff without dropping the tool mid-cut.
  • First charge after storage: If the battery has been sitting, run a full charge before first use — Li-ion cells partially discharged in storage need one complete cycle to recalibrate capacity reporting on the charger.

Why capacity matters on a chainsaw pulling sustained load

Chainsaws draw hard, uneven current — especially through knots or dense limbs. A 5000mAh cell pack handles those current spikes without the BMS tripping an overcurrent fault. Smaller capacity packs on the same voltage can shut the tool down mid-cut when load spikes. The 200Wh total energy rating here gives the BMS more headroom to manage those peaks.

Battery not recognized by the charger — here's why

GreenWorks 40V chargers handshake with the battery's BMS before starting a charge cycle. If the charger flashes an error and won't start, the cells may have discharged below the BMS recovery threshold during shipping. Connect the battery for 30 seconds, disconnect, then reconnect — this wakes the protection circuit and allows the charger to establish communication and begin charging normally.

Compatible Models

40V 12" Chainsaw 2020002 40V 8" Cordless Pole Saw 1403702 40V 15" Cordless String Trimmer 2111802 40V 14" Cordless Dethatcher 2505102 40V Cordless 12" String Trimmer 2111702 1403302 40V 12" Brushless String Trimmer 2110802 40V 20" Brushless Lawn Mower 2516302 40V Cordless Leaf Blower 450 CFM 2416102VT 40V 16" Brushless Cordless Chainsaw 2016802AZ 40V Cordless 20" Brushless Snow Blower 2605302 2411902VT 40V Bucket Pressure Washer 5108402AZ 40V 14" Cordless Dethatcher / Scarifier 2528802 40V 19" Mower Combo Kit w/ Leaf Blower 1341302-VK 40V 14" Brushless Cordless Chainsaw 2012802 40V 16" Cordless Chainsaw 2009702 40V 14" Cordless Lawn Mower 2508202 40V Brushless 19" Lawn Mower 2524902 40V 17" Cordless Lawn Mower / Blower Combo Kit 1306302AZ 40V 21" Brushless Lawn Mower 2515502VT 40V 19” Brushless Lawn Mower 2539602VT 40V Cordless Leaf Blower 500 CFM 2416302AZVT 40V 16" Brushless String Trimmer 2120602AZ 40V Cordless Leaf Blower 350 CFM 2412002VT 40V 21" Brushless Self-Propelled Lawn Mower 2516402 40V 19" Mower Combo Kit w/ String Trimmer & Blower 1341202-VK 40V 14" Cordless Lawn Mower / Blower Combo Kit 1306202AZ 40V 21" Self-Propelled Mower/Axial Blower Combo Kit 1306402AZ 40V 14" Lawn Mower Axial Blower & 12" String Trimmer Combo Kit 1310802AZ 40V 14" Brushless String Trimmer 2110902 40V Cordless Brushless Axial 550 CFM Leaf Blower 2416502AZVT 2525202VT

Replaces Part Numbers

GWG40B2 GWG40B4

Technical Specifications

Voltage40V
Amp Hours5000mAh
Capacity5000mAh
Rate200Wh
Net Weight1127g /39.75 oz
Gross Weight1317g /46.46 oz
Approximate Weight1317g /46.46 oz
Dimension 165.50 x 84.10 x 86.00mm

Product Highlights

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

Frequently Asked Questions

My Greenworks chainsaw cuts fine for a few branches then suddenly dies mid-cut — why does it keep shutting off?

That's thermal cutoff triggering under sustained load — the battery's BMS is detecting a temperature spike and disconnecting to protect the cells. It happens most often when the chain is dull or the bar oil is low, because both force the motor to work harder and pull more current through the pack. Let the battery cool for 15 minutes off the saw, then check your chain tension and oil reservoir before restarting. If it trips again within the first few cuts, put a multimeter on the pack terminals at rest — a healthy 40V Li-ion should read between 40V and 42V; anything under 36V means the cells are degraded and can't sustain high-draw loads.

I put this replacement battery in my Greenworks chainsaw and the chain is spinning slower than it did with the old pack — is something wrong with it?

Voltage sag under load is the most likely cause — a new pack that hasn't been cycled yet, or one that shipped partially discharged, will sag harder than a conditioned pack when the saw bites into wood. Charge the battery fully, run it through two complete discharge-and-charge cycles, and test again on a real cut, not just the trigger at idle. If the chain speed still feels weak compared to your original pack, check that the battery is fully seated and the terminal contact pins are clean and making solid contact. A resting voltage below 40V before you even start cutting confirms the pack didn't arrive with a full charge.

The Greenworks charger shows solid green but my chainsaw barely has any power — did I get a bad battery?

The charger reads the pack as "full" based on voltage alone, but if the cells have low capacity or unbalanced cells, the pack can hit terminal voltage quickly without actually storing a full charge. We see this on bench tests when a replacement pack hasn't been properly formation-charged at the factory — it measures correct voltage but collapses under chainsaw-level current draw. Top-charge the battery, let it sit 10 minutes off the charger, and measure the open-circuit voltage at the terminals — it should hold steady between 41V and 42V. If it reads correctly but the saw still bogs on the first cut, run one full deep discharge cycle and recharge completely before drawing any conclusions.

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