Firestorm A18 14.4V Drill Battery Replacement 2100mAh Ni-MH
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Firestorm A18 14.4V Drill Battery Replacement 2100mAh Ni-MH - is backordered and will ship as soon as it is back in stock.
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Battery Care Tips
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.
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Delivery and Shipping
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Disclaimer
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🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.
Firestorm A18 14.4V Drill Battery Replacement 2100mAh Ni-MH - is backordered and will ship as soon as it is back in stock.
Voltage
14.4V
Amp
2100mAh
Firestorm BD14PSK Series — 14.4V Ni-MH Replacement Battery (A18)
This is a 14.4V 2100mAh Ni-MH battery for the Firestorm BD14PSK drill/driver and compatible models in the FS1200D, FS1202BN, and related series. It replaces OEM part numbers A18, FSB18, FS18BX, and FS140BX among others. Slot it into any charger dock that accepted the original pack.
- BD14PSK and FS-series compatibility: These models share the same 14.4V rail, slide-pack connector orientation, and contact pin layout. The BMS on each tool reads cell voltage through the same three-terminal handshake, so one pack covers the full compatibility list without modification.
- Bench tested on actual hardware: We ran this pack on a BD14PSK through repeated trigger-pull cycles at full torque load. The BMS held its overcurrent threshold without nuisance tripping, and cell voltage recovery between pulls stayed within the expected Ni-MH profile.
- First-cycle conditioning on the BD14PSK: Run the drill at half load for two full discharge-and-charge cycles before driving at maximum torque. This lets the BMS profile the motor's inrush current draw and calibrate its overcurrent protection threshold to your specific tool's draw signature.
BMS overcurrent trip on BD14PSK motor-start inrush
When you pull the trigger on a BD14PSK, the motor draws a brief inrush spike — often two to three times the steady-state current — before the armature starts spinning. A new Ni-MH pack that hasn't been conditioned may have its BMS overcurrent threshold set conservatively from the factory. That threshold can cause the pack to cut out at the spike rather than sustaining it. Running two half-load cycles first lets the BMS log the inrush signature and widen its trip window accordingly.
Drill bogs under load but shows green on the charger
The charger reads resting cell voltage, not loaded voltage. A pack can sit at 14.4V at rest and sag to 11V or lower the moment the motor pulls current under a fastening load. On Ni-MH packs, this voltage sag usually means elevated internal resistance from repeated shallow cycling — topping up the pack after light use rather than running it down. To recover, run the pack to full discharge under moderate load, then charge to completion. If sag persists past two full cycles, check the slide-pack contact rails on the tool for oxidation and clean with isopropyl alcohol before concluding the cells are at fault.
Compatible Models
Replaces Part Numbers
Technical Specifications
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 BD14PSK cuts out the instant I pull the trigger on a tough screw — pack seems fully charged. What's happening?
That's a BMS overcurrent trip, not a dead pack. The motor-start inrush spike on a loaded drill briefly exceeds the BMS's trip threshold, and a new or storage-rested Ni-MH pack is most likely to trigger it. Run two full cycles at half torque first so the BMS can profile the inrush draw and set a wider cutoff window. After conditioning, the pack should sustain full-trigger pulls without dropping out.
The drill runs fine for the first few holes then suddenly feels weak and slow — what's causing that?
That's thermal cutoff signalling, not general wear. Sustained drilling through dense material heats both the motor and the Ni-MH cells inside a compact housing with limited airflow. Once cell temperature hits the BMS thermal threshold, the pack reduces current output to protect the cells. Let the pack rest for 10 minutes off the tool, then check resting voltage — it should read at or above 14.4V. If it does, heat was the cause; pace heavy drilling sessions with short breaks between holes.
Charger blinks red and won't accept the new pack — it's never been used. What do I do?
Most Black & Decker and Firestorm chargers reject packs where individual cells have self-discharged below the charger's minimum acceptance voltage during storage. This is common on packs that sat in a warehouse. Place the pack in the charger and hold it in firm contact for 60 seconds — some chargers will pulse a recovery charge if the pack is seated long enough. If the light stays red, check that the slide-pack contacts are clean and fully seating; oxidation on the rails can read to the charger as a faulty cell. A successful recovery charge will bring the pack above 13V before the charger switches to normal mode.
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