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Black & Decker LB20 18V Cordless Drill Replacement Battery 4000mAh

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From $91.99 USD $113.99
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Fits Black & Decker ASD18 Type 1 and ASD18 Type 2 drills, replacing OEM part numbers LB20, LB2X4020, LBX20, LBXR20, and LBXR2020.
18V at 4000mAh capacity delivers consistent power for drilling, driving, and fastening without voltage sag under sustained load.
Slide connector interfaces with the Black & Decker platform locking tab — seats flush and clips without forcing.
We bench-tested against the ASD18 motor load; BMS stayed stable through trigger inrush and held voltage during sustained drilling cycles.
On first use with the ASD18 housing, run the tool at half load for two cycles before maximum torque applications — allows the BMS to profile motor inrush current before locking overcurrent protection thresholds.
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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

18V

Amp

4000mAh

Black & Decker ASD18 Series — 18V Li-ion 4000mAh Replacement Battery (LB20 / LBXR20)

This 18V 4000mAh Li-ion battery replaces the LB20, LBXR20, LBXR2020, and related OEM packs across the Black & Decker ASD18 and ASD184 cordless drill and driver range. It slots into the same slide-rail chassis as the original and communicates with the same BMS handshake those tools expect. Capacity comes from the product specification — 4000mAh, 72Wh.

  • ASD18 and ASD184 compatibility: Both the Typ 1 and Typ 2 variants of the ASD18 and ASD184 use the same 18V slide-rail connector and accept the same BMS communication protocol. The battery fits all four variants without adapters or firmware changes.
  • Bench tested on actual hardware: We ran this pack through repeated motor-start inrush cycles on an ASD18 Typ 1. The BMS held the overcurrent threshold correctly on each trigger pull and did not trip under normal drilling loads. Cell balancing completed without fault codes on the charger.
  • Break-in for motor-start protection: On first use, run the drill at half load for two full cycles before applying maximum torque. This lets the BMS profile the motor's inrush current draw and calibrate its overcurrent protection thresholds before you put the tool under heavy fastening loads.

BMS overcurrent trip on ASD18 motor-start inrush

When you pull the trigger hard on a stalled or high-resistance fastener, the ASD18 motor pulls a short inrush spike that can exceed the BMS overcurrent threshold — especially on a cold or freshly installed pack. The BMS reads that spike as a fault and cuts the output rail, which looks like the tool dying mid-use. The fix is to bring the pack up to room temperature before heavy use and avoid jamming the trigger at full speed into a stalled bit. If the pack keeps tripping, check the rail contacts on the tool for oxidation — contact resistance amplifies voltage drop at the BMS sense resistor.

Charger blinking red and refusing to accept the pack after storage

Li-ion cells left unused for several months can self-discharge below the charger's acceptance voltage — typically around 2.5V per cell. Most Black & Decker 18V chargers will blink red and reject the pack when any cell reads below that threshold on initial connection. To recover the pack, connect it to the charger and wait up to five minutes — some chargers run a trickle recovery mode before switching to full charge. If the charger still rejects it after ten minutes, measure the pack voltage at the output terminals; a reading below 12V across the 18V pack means one or more cells have dropped too far for safe recovery.

Compatible Models

ASD18 Typ 1 ASD18 Typ 2 ASD184 Typ 1 ASD184 Typ 2 ASL186 H1 ASL186K ASL188 H1 ASL188K BCD001 H1 BCD001 H2 BCD002 H1 BCD002 H2 BCD003 Typ 1 BCD700S H1 BDASB18 H1 BDC120VA100 BDCCS18 Typ 1 BDCD18H1 BDCDC18 H1 BDCDD186 H1 BDCDMT120 BDCDMT120-2 BDCDMT120F BDCDMT120IA BDCF20 BDCHD18 H1 BDCR18 H1 BDGDC18 Typ 1 BDH18 H1 BDH2000SL BDHD18 H1 BDK188 Typ 1 BL186 H1 BL188 H1 CHH2220 EGBHP188 H1 EGBHP1881 Typ 1 EGBL18 Typ 1 EGBL188 H1 EPL188 H1 EPL188KB GKC1820L H1 GKC1820L H2 GLC1823L Typ 1 GLC1825H1 GPC1820L H1 GPC1820L H2 GTC1843L H1 GTC1843L H2 GTC1845L Typ 1 GTC1850L H1 GTC650L H1 GWC1800 H1 GWC1800L H1 HP186F4LBK H3 HP188F4LBK H3 LCC220 LCS1020 LCS120 LCS120B LD120VA LD3K220 LDX120C LDX120PK LDX120SB LDX20C LDX220SB LDX220SBFC LGC120 LHT120 LHT2220 LLP120 LPHT120 LPHT120B LPP120 LPP120B LST120 LST220 LST300 LST400 LST420 LSW120 LSW20 LSW221 MT18 Typ 1 MT188 Typ 1 MT18SSK Typ 1 MT218H1 SSL20SB SSL20SB-2 ST1823 Typ 1 STC1815 Typ 1

Replaces Part Numbers

LB20 LB2X4020 LBX20 LBXR20 LBXR2020 LBXR20B LBXR20-OPE

Technical Specifications

Voltage18V
Amp Hours4000mAh
Capacity4000mAh
Rate72Wh
Net Weight612g /21.59 oz
Gross Weight792g /27.94 oz
Approximate Weight792g /27.94 oz
Dimension 119.10 x 78.90 x 50.95mm

Product Highlights

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

Frequently Asked Questions

My ASD18 cuts out the instant I pull the trigger hard — is the battery dead or is something else tripping it?

That's a BMS overcurrent trip, not a dead pack. The motor-start inrush spike on a stalled bit briefly exceeds the BMS protection threshold, and the BMS shuts the output rail as a fault response. Let the pack warm to room temperature, then ease into the trigger rather than flooring it against a stalled fastener. Clean the slide-rail contacts on the tool with isopropyl alcohol — oxidised contacts raise contact resistance and make the voltage drop at the BMS sense resistor look worse than it actually is.

The drill runs fine at low speed but bogs badly under heavy load — charged the battery fully and it still does it.

That's voltage sag under sustained load, not a capacity issue. As current demand rises, internal resistance across the cells causes the voltage rail to drop, and the tool's motor controller backs off to protect itself. Check the slide-rail contacts on both the battery and the tool for corrosion or debris — even a thin film of oxidation raises contact resistance and makes sag worse. If the contacts are clean and the sag persists, the cells may have degraded from repeated shallow cycling; a full discharge-to-cutoff followed by a full charge will let the BMS recalibrate its state-of-charge window.

My Black & Decker 18V charger never moves past the red blink on this new pack — it was sitting in the box for months before I tried to charge it.

Extended storage lets Li-ion cells self-discharge below the charger's acceptance voltage — around 2.5V per cell on this chemistry. The charger sees a low-voltage pack and holds the red blink as a protection response rather than entering full charge mode. Leave the pack connected for up to ten minutes; most Black & Decker 18V chargers run a low-current trickle recovery sequence before switching to normal charge. If the red blink continues past ten minutes, measure the pack at the output terminals — a reading below 12V across the pack indicates cells have dropped beyond safe recovery range.

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