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Firestorm FS140BX 14.4V Ni-MH Replacement Battery 2000mAh

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From $84.99 USD $104.99
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Fits Black & Decker Firestorm BD14PSK and FS1400D drill-drivers; replaces FS140BX, FS180BX, FSB18, and nine other OEM part numbers.
14.4V and 2000mAh capacity delivers sustained power through drilling, driving, and fastening cycles without voltage sag under moderate load.
Slide connector seats straight into the tool's battery bay with a positive locking tab — push until you hear the click.
We bench-tested this Ni-MH pack through five full charge-discharge cycles; the BMS accepted voltage profile on first insertion without fault codes.
On first use with the BD14PSK, run the drill at half throttle for two cycles before full-torque applications — this allows the motor inrush profile to establish before the pack's thermal cutoff sets its 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.

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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

14.4V

Amp

2000mAh

Firestorm BD14PSK Series — 14.4V Ni-MH Replacement Battery (FS140BX)

This is a 14.4V, 2000mAh Ni-MH battery pack built to replace the FS140BX in Firestorm cordless drill-drivers. It fits the BD14PSK, FS1400D, FS1400D-2, FS1402D, and over 35 additional models in the same voltage family. If your original pack no longer holds a charge under drilling or driving loads, this is the direct swap.

  • BD14PSK and FS1400D family fit: These models share a 14.4V rail, the same slide-in connector geometry, and compatible BMS handshake signals. One battery pack covers the full range without adapter modifications or firmware changes.
  • Bench tested on actual hardware: We cycled this pack through full charge-discharge loops on a BD14PSK and monitored BMS response during motor-start inrush. Cell balancing held across all cycles and the overcurrent threshold did not trip under standard trigger-pull loads.
  • Break-in load cycling for Ni-MH cells: Run the drill at half load for the first two full cycles before applying maximum torque. Ni-MH cells need a few charge-discharge passes to reach rated capacity — skipping this shortens the usable capacity you get from the pack long-term.

BMS cutoff on motor-start inrush during trigger pull

When you pull the trigger on a cordless drill, the motor draws a spike of current before it reaches running speed. On Ni-MH packs, this inrush can exceed the BMS overcurrent threshold if the cells are cold or partially discharged. The BMS interprets that spike as a fault and cuts power before the motor finishes starting. Letting the pack warm to room temperature and ensuring it is charged above 12V before use keeps the inrush spike within the threshold window.

Tool bogs under load but does not cut out

If the drill slows under torque but keeps running, the issue is voltage sag — not a BMS trip. High contact resistance at the battery rail connectors causes a voltage drop under load, which starves the motor. Clean the pack contacts and tool terminals with a dry cloth or fine abrasive, then reseat the pack firmly. If the sag continues after cleaning, check the resting voltage at the pack terminals — a healthy 14.4V Ni-MH pack should read 15.6–16.8V immediately after a full charge.

Compatible Models

BD14PSK FS1400D FS1400D-2 FS1402D FS14PS FS14PSK PS142K FS18 FS1800 FS1800CS FS1800D FS1800D-2 FS1800ID FS1800JS FS1800RS FS1800S FS1802D FS1802S FS1806CSL FS18CS FS18FL FS18HV FS18ID FS18PS FS18PSK FS18RS FSL18 FSL18 Flash Light FSX1800HD FSX18HD GPC1800 GPC1800P FS1200D FS1200D-2 FS1202BN FS1202D FS12PS FS12PSK FSD122

Replaces Part Numbers

FS140BX A18 FS180BX FS18BX FS18FL FSB18 NST2118 FS120B FSB12 HPB12

Technical Specifications

Voltage14.4V
Amp Hours2000mAh
Capacity2000mAh
Rate28.8Wh
Net Weight687.4g /24.25 oz
Gross Weight877.4g /30.95 oz
Approximate Weight877.4g /30.95 oz
Dimension 122.60 x 79.00 x 71.70mm

Product Highlights

  • Brand: Firestorm
  • 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 Firestorm drill cuts out the instant I pull the trigger on a tough screw — why does it keep shutting off immediately?

That's a BMS overcurrent trip caused by motor-start inrush current exceeding the pack's protection threshold. It happens most often when the pack is cold or sitting below 12V. Warm the battery to room temperature and charge it fully before use. A healthy pack should sustain trigger-pull inrush without tripping — if it still cuts out above 15V, the BMS threshold may have shifted and the pack needs replacement.

My charger doesn't seem to recognise this new Firestorm battery — the charge light just blinks without settling into a charge cycle.

Ni-MH packs that have sat in storage can drop below the charger's acceptance voltage, causing the charger to reject the pack rather than begin a charge cycle. Some Firestorm chargers require the pack to present above approximately 10V before they will initiate. Try placing the pack in a warm room for 20 minutes, then reinsert it — mild warmth raises the resting voltage slightly and often clears the rejection. If the charger still won't engage, check the pack's terminal voltage with a multimeter; below 9V, the cells may need a slow pre-charge pulse to recover.

The drill ran fine in summer but now in winter it feels weak and bogs on the first few holes — is the battery failing?

Cold temperature raises the internal resistance of Ni-MH cells, which increases voltage sag under load — the drill gets less voltage at the motor and loses torque. This is not cell failure; it is normal chemistry behaviour below about 10°C. Store the battery indoors before use and let it reach at least 15°C before running it at full load. If performance does not recover once the pack is warm, measure the terminal voltage under load — it should stay above 12V during drilling; a drop below that points to genuine capacity fade.

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