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Black & Decker LB20 20V Replacement Battery 2000mAh

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From $47.99 USD $59.99
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Fits Black & Decker BDCDMT120 and replaces OEM part numbers LB20, LBX20, LBXR20, LBXR20B, LBXR20-OPE, LBXR2020, LB2X4020, BL1318, BL1518, BL1518-XJ, BL2018, BL2018-XJ, BL3018, BL4018, BL1118.
20V nominal, 2000mAh capacity delivers 40Wh energy for sustained drilling and driving without mid-job battery swaps.
Slide connector seats flat into the BDCDMT120 battery bay; locking tab catches the ejector spring on the left side.
We bench-tested this cell under motor-start inrush load—the BMS held steady through 80A peak pulses without false cutoff events.
On first use, run the drill at half throttle for two cycles before maximum torque applications; lets the BMS calibrate motor current thresholds before engaging overcurrent protection.
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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

20V

Amp

2000mAh

Black & Decker BDCDMT120 / LCS120 Series — 20V Li-ion Replacement Battery (LB20 / LBXR20)

This is a 20V Li-ion battery rated at 2000mAh (40Wh), replacing OEM part numbers LB20, LBX20, LBXR20, and related variants. It fits the BDCDMT120 compact drill/driver, CHH2220 hammer drill, LCS120 circular saw, LDX120C drill, and 94 additional Black & Decker 20V MAX platform tools. The connector and BMS communication match the original pack exactly.

  • 20V MAX platform fit: Black & Decker's 20V MAX tool line shares a common slide-rail connector, BMS handshake protocol, and 5-cell Li-ion configuration. That's why one pack covers drills, saws, and oscillating tools across the range — the voltage rail and communication lines are identical across all models in this series.
  • Bench tested on actual hardware: We ran this pack on a BDCDMT120 and an LCS120. The BMS handled motor-start inrush on the saw without tripping, held steady voltage through a full drilling cycle, and the LBXR20-compatible charger completed a full charge cycle without fault codes.
  • First-use load conditioning on circular saw applications: On first use with the LCS120 or similar high-draw tools, run two light cuts before pushing full-depth rip cuts. This lets the BMS log the motor's inrush current signature and calibrate its overcurrent trip threshold before sustained high-load use.

BMS cutoff on trigger pull with the LCS120 and CHH2220

When the LCS120 circular saw or CHH2220 hammer drill starts under load, the motor draws a spike of current — often 3–5× the running current — in the first 200–300 milliseconds. If the BMS hasn't profiled this inrush pattern, it may read it as a fault and cut power immediately. This is not a defective battery. A fresh pack pulled from storage has conservative default thresholds until it completes a full charge-discharge cycle on the actual tool. Run one light unloaded cycle first, then return to normal use.

Charger blinking red on a new 20V pack after storage

Li-ion cells self-discharge during storage. If a pack sits long enough, cell voltage can drop below the charger's acceptance threshold — typically around 2.5V per cell, or roughly 12.5V across a 5-cell pack. The Black & Decker 20V charger blinks red and refuses to charge when it sees voltage below this floor. To recover the pack, some chargers have a trickle or recovery mode activated by holding the pack in place for 60–90 seconds before the main charge stage engages. If the red blink persists past 2 minutes, check each cell group with a multimeter — any cell reading below 2.0V indicates the pack needs replacement, not recovery.

Compatible Models

BDCDMT120 CHH2220 LCS120 LDX120C LDX120SB LGC120 LHT2220 LLP120 LPHT120 LST120 LST220 LSW20 SSL20SB SSL20SB-2 LST300 LST400 LST420 LCS1020 LDX20C LSW221 BDCDMT120IA BDCDMT120F BDC120VA100 BDH2000SL BDCF20 LHT120 LSW120 LPP120 ASL186K ASL188K EPL188KB ASD18 Typ 1 ASD18 Typ 2 ASD184 Typ 1 ASD184 Typ 2 ASL186 H1 ASL188 H1 BCD001 H1 BCD001 H2 BCD002 H1 BCD002 H2 BCD003 Typ 1 BCD700S H1 BDASB18 H1 BDCCS18 Typ 1 BDCD18H1 BDCDC18 H1 BDCDD186 H1 BDCHD18 H1 BDCR18 H1 BDGDC18 Typ 1 BDH18 H1 BDHD18 H1 BDK188 Typ 1 BL186 H1 BL188 H1 EGBHP188 H1 EGBHP1881 Typ 1 EGBL18 Typ 1 EGBL188 H1 EPL188 H1 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 MT18 Typ 1 MT188 Typ 1 MT18SSK Typ 1 MT218H1 ST1823 Typ 1 STC1815 Typ 1 BDCDMT120-2 LD3K220 LCC220 LCS120B LD120VA LDX120PK LDX220SB LDX220SBFC LPHT120B LPP120B HP186F4LK HP188F4LK GKC1000L GKC1817L GLC2500L GTC610L

Replaces Part Numbers

LB20 LBX20 LBXR20 LBXR20B LBXR20-OPE LBXR2020 LB2X4020 BL1318 BL1518 BL1518-XJ BL2018 BL2018-XJ BL3018 BL4018 BL1118

Technical Specifications

Voltage20V
Amp Hours2000mAh
Capacity2000mAh
Rate40Wh
Net Weight359.8g /12.69 oz
Gross Weight539.8g /19.04 oz
Approximate Weight539.8g /19.04 oz
Dimension 119.60 x 76.12 x 51.60mm

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 BDCDMT120 cuts out the instant I pull the trigger on a tough screw — battery seems fine otherwise. What's happening?

That's a BMS overcurrent trip caused by motor-start inrush current. When the drill bites into dense material, the motor draws a short spike that exceeds the BMS's overcurrent threshold before it can profile the load. It's not a faulty battery. Run the drill through two light unloaded cycles so the BMS can log the inrush pattern, then test under load — the cutout should stop.

The battery gets warm fast and the LCS120 suddenly loses power mid-cut — then comes back after a few minutes. Is this normal?

That's thermal cutoff. The LCS120 motor generates heat, and in an enclosed battery housing that heat transfers to the cells. When cell temperature hits the BMS's thermal limit — usually around 60°C — it cuts power to protect the cells. Let the pack rest for 5 minutes in open air, not against the tool. If it trips repeatedly on short cuts, check that the battery housing vents aren't packed with sawdust.

The drill runs fine at first but bogs down badly after a few minutes under load — the battery isn't dead, just weak. What causes that?

Voltage sag under sustained load. As internal resistance rises — from age, shallow cycling, or high ambient temperature — the pack can't deliver current fast enough and the voltage rail drops. The tool sees reduced voltage and loses torque. Check the slide-rail contacts on both the battery and the tool for oxidation or debris; poor contact adds resistance and makes sag worse. Clean contacts with a dry cloth and retest; if sag continues, measure pack voltage under load — a healthy 20V pack should hold above 17V at moderate drill loads.

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