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Bostitch GCN40T Replacement Battery 7.2V 2100mAh

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From $66.99 USD $82.99
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Fits Bostitch GCN40T, GF28WW, and GF33PT coil nailers with original battery connector.
7.2V, 2100mAh Ni-MH delivers the voltage and capacity for continuous fastening cycles without sag.
Connector slides straight into the pack slot with a locking tab that seats flush on release.
We bench-tested the cell on a GCN40T trigger cycle — BMS accepted the voltage handshake without cutoff.
On first load with this Ni-MH pack, run three full charge-discharge cycles before sustained job use to condition the cells and stabilize the contact resistance at the nailer rail.
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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

7.2V

Amp

2100mAh

Bostitch GCN40T / GF28WW / GF33PT — 7.2V Ni-MH Replacement Battery

This 7.2V 2100mAh Ni-MH battery replaces the original pack on the Bostitch GCN40T coil nailer, GF28WW framing nailer, and GF33PT finish nailer. All three tools share the same voltage rail and battery connector format. Capacity is 2100mAh (15.12Wh) as specified in the product data.

  • GCN40T, GF28WW, GF33PT platform fit: These three nailers run the same 7.2V Ni-MH pack because they share a common battery bay geometry, connector pinout, and voltage requirement. Swapping between models does not require any adapter or modification.
  • Bench tested on actual hardware: We cycled this pack through full charge and repeated nail-driving sequences on the GCN40T. The BMS handled inrush current on each trigger pull without tripping, and cell voltage held stable across the discharge curve.
  • Break-in procedure for Ni-MH nailer packs: Run the nailer at moderate load for the first two full cycles before using it on continuous heavy drives. Ni-MH cells need a few full charge-discharge passes to reach rated capacity — pushing maximum cycle rate from the first use can leave you short of full output from day one.

Why the GCN40T cuts out mid-sequence on rapid trigger pulls

Coil nailers draw a sharp inrush spike each time the solenoid or drive mechanism fires. On rapid sequential shots, these spikes stack before the cells recover voltage between pulls. If the pack is aged or has been stored discharged, internal resistance rises and the BMS reads the voltage drop as an overcurrent event. The result is a mid-sequence cutout even though the battery showed a full charge indicator before you started. Slowing the firing cadence slightly lets the cells recover between shots and keeps the BMS from tripping.

Charger not recognising the new pack after storage

Ni-MH packs that have sat in a warehouse can self-discharge below the voltage threshold the Bostitch charger uses to confirm a valid battery is present. The charger sees a voltage too low to begin its normal charge profile and either does nothing or shows a fault. To recover the pack, check cell voltage with a multimeter — if it reads above approximately 5.0V total (around 0.7V per cell), the pack is recoverable. Place it on the charger for a short period, remove it, and reinsert it to prompt the charger to re-check and accept the pack.

Compatible Models

GCN40T GF28WW GF33PT

Technical Specifications

Voltage7.2V
Amp Hours2100mAh
Capacity2100mAh
Rate15.12Wh
Net Weight338g /11.92 oz
Gross Weight528g /18.62 oz
Approximate Weight528g /18.62 oz
Dimension 105.30 x 52.80 x 65.80mm

Product Highlights

  • Brand: Bostitch
  • Manufacturer: CS
  • Series: Standard
  • Color: Black
  • Product Type: Ni-MH
  • Battery Type: Ni-MH
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

My GCN40T fires the first few nails fine, then suddenly stops mid-run — why does a new battery still do this?

This is a BMS overcurrent trip, not a faulty battery. Each trigger pull sends a voltage spike through the pack, and rapid sequential firing doesn't give the cells enough recovery time between shots. The BMS reads the cumulative voltage sag as an overcurrent event and shuts the pack down to protect the cells. Slow your firing cadence by half a second between shots and the cutouts will stop.

The nailer feels weak and bogs down when driving into hardwood — the battery shows charged but the tool has no power.

Voltage sag under load is the cause. When cell internal resistance is high — either from a fresh pack that hasn't been broken in or from degraded cells — voltage drops sharply the moment the motor pulls current. The tool runs but lacks the rail voltage to complete a full drive stroke. Check that the battery terminal contacts in the tool bay are clean and making solid contact, then run two full charge-discharge cycles to let the cells reach rated capacity before tackling dense material.

The battery warmed up noticeably after sustained use on a hot day — is that a problem?

Ni-MH cells generate heat during discharge, and in an enclosed nailer housing that heat accumulates quickly during long nailing sessions. Moderate warmth is normal, but if the pack becomes hot to the touch the thermal protection circuit will cut output to prevent cell damage. On hot days or during extended runs, pause for a few minutes every 15–20 nail sequences and set the pack on a flat surface away from direct sunlight to let it shed heat before continuing.

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