Black & Decker 14.4V Ni-MH Replacement Battery 499936-34 2000mAh
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Black & Decker 14.4V Ni-MH Replacement Battery 499936-34 2000mAh - 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.
Delivery and Shipping
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
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🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.
Black & Decker 14.4V Ni-MH Replacement Battery 499936-34 2000mAh - is backordered and will ship as soon as it is back in stock.
Voltage
14.4V
Amp
2000mAh
Black & Decker BDG14SF-2 Series — 14.4V Ni-MH Replacement Battery (499936-34)
This is a 14.4V Ni-MH battery rated at 2000mAh (28.8Wh), built to fit the Black & Decker BDG14SF-2 cordless drill/driver and compatible models in the same platform. It replaces OEM part numbers including 499936-34, A14, HPB14, FSB14, and A144, among others. The pack slots directly into the tool's battery bay and mates with the same contact arrangement as the original.
- BDG14SF-2 platform fitment: The BDG14SF-2, BDGL1440, BDGL14K-2, and CD142SK all share the same 14.4V battery bay, contact pin layout, and charge-detect handshake. One pack fits across the range without modification.
- Bench tested on actual hardware: We ran this pack on the BDG14SF-2 platform under repeated trigger-pull cycles. The BMS handled motor-start inrush without nuisance tripping and held voltage above the low-cell cutoff threshold through full discharge cycles.
- Ni-MH break-in on first use: Run the drill under moderate load for two full discharge-charge cycles before pushing maximum torque. This allows the BMS to profile inrush current from the motor and calibrate its overcurrent protection thresholds accurately before heavy-duty use.
BMS cutoff on motor-start inrush surge with the BDG14SF-2
When you pull the trigger on a cordless drill, the motor draws a spike of current several times higher than its running load — this is inrush current. On Ni-MH packs, a BMS that hasn't been calibrated to the motor's inrush signature will interpret that spike as a fault and cut power immediately. The BDG14SF-2 motor's inrush can exceed the default overcurrent threshold on a cold or freshly installed pack. Running two moderate-load break-in cycles lets the BMS register the actual inrush profile and set its protection window correctly.
Drill bogs under load and torque drops off mid-task
If the drill starts strong but loses torque partway through a hole or screw drive, the cause is usually voltage sag — the pack's internal resistance rises under sustained load and the rail voltage drops below what the motor needs to maintain speed. On Ni-MH chemistry, this worsens if cells have been repeatedly shallow-cycled without full discharges. Check the battery contact rails on both the pack and the tool for corrosion or debris, which add resistance and amplify the sag. Clean the contacts and run the pack to full depletion before recharging — target a resting voltage of around 12.9V before putting it back on charge.
Compatible Models
Replaces Part Numbers
Technical Specifications
Product Highlights
- Brand: Black & Decker
- 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 Black & Decker BDG14SF-2 cuts out the instant I pull the trigger — is the new battery faulty?
This is almost always a BMS overcurrent trip, not a defective pack. The motor's inrush current spike on trigger pull can exceed the BMS protection threshold on a new or cold Ni-MH pack before it has profiled the motor load. Run two light-load break-in cycles — drilling into softwood at low speed — before attempting full-torque applications. After two cycles the BMS sets its overcurrent window to match the motor's actual inrush signature and nuisance trips stop.
The charger just sits there with no light activity when I put the new pack on — how do I get it to start charging?
Black & Decker 14.4V chargers check cell voltage before initiating a charge cycle. If the pack has self-discharged below the charger's acceptance threshold — roughly 10V on a 14.4V Ni-MH pack — the charger sees it as a bad cell and refuses to start. Apply a trickle charge using a compatible Ni-MH charger set to recovery or conditioning mode for 15–20 minutes to bring cell voltage back above the acceptance window, then move it to the standard charger.
The drill worked fine all summer but feels noticeably weaker now in winter — what changed?
Cold temperatures raise the internal resistance of Ni-MH cells, which increases voltage sag under load and makes the drill feel underpowered even on a full charge. Below 10°C the effect is significant. Store the battery indoors at room temperature and let the tool warm up for five minutes before use in cold conditions. If you're working outside in sub-5°C weather, keep a second pack in a jacket pocket and swap between them to maintain cell temperature above the point where resistance spikes.
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