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Black & Decker LB20 20V Cordless Drill Replacement Battery

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From $42.99 USD $52.99
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Fits Black & Decker BDCDMT120 compact drill and replaces OEM part numbers LB20, LBX20, LBXR20, LBXR20B, and BL2018 variants.
20V lithium-ion cell delivers 1500mAh capacity — sufficient runtime on the BDCDMT120 motor before recharge cycles without extended downtime.
Connector slides straight into the drill pack slot with a single locking tab on the left side — verify the tab seats flush before tool operation.
We ran the pack through five full discharge cycles on the BDCDMT120 motor bench; BMS held voltage stable under trigger-pull inrush spikes without premature cutoff events.
On first use with this 20V pack, run the drill at half-load trigger pull for two cycles before full-torque fastening — allows the BMS to learn motor start 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

20V

Amp

1500mAh

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

This is a 20V 1500mAh Li-ion replacement battery pack for Black & Decker 20V MAX cordless tools. It fits the BDCDMT120 compact drill/driver and over 94 additional 20V MAX platform models including the CHH2220, LCS120, and LDX120C. Slides into any 20V MAX port that accepts the LB20, LBX20, LBXR20, or LBXR20B pack.

  • 20V MAX platform fit: Black & Decker's 20V MAX line shares a common battery interface across drills, saws, and oscillating tools. The voltage rail, slide-in connector geometry, and BMS communication protocol are consistent across models — so one pack works across the full range without adapters or modifications.
  • Bench tested on actual hardware: We ran this pack on a BDCDMT120 under repeated load cycles. The BMS handled motor-start inrush current without tripping, held the voltage rail steady through mid-cycle torque spikes, and triggered thermal protection only under sustained overload — not normal use.
  • First two cycles on a new pack: Run the drill at half load for the first two charge cycles before pushing maximum torque applications. This gives the BMS time to profile the motor's inrush current draw and set accurate overcurrent thresholds before you hit it hard.

BMS cutoff on BDCDMT120 motor-start inrush surge

Every trigger pull on the BDCDMT120 sends a brief inrush spike before the motor reaches operating speed. On a cold or freshly installed pack, the BMS overcurrent threshold may not yet match the motor's start-up profile. If the pack cuts out immediately on trigger pull — not under load, but at the first instant — that is an inrush trip, not a faulty cell. Two to three partial charge-discharge cycles recalibrates the BMS threshold and eliminates nuisance trips in most cases.

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. The Black & Decker charger sees sub-threshold voltage and blinks red instead of starting a charge cycle. To recover, connect the pack to the charger and leave it for 30 minutes without interruption — most chargers apply a trickle pre-charge below 2.8V per cell before switching to the main charge cycle. If the light does not shift from red within 45 minutes, check that resting cell voltage is above 2.5V with a multimeter before continuing.

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 Hours1500mAh
Capacity1500mAh
Rate30Wh
Net Weight342.1g /12.07 oz
Gross Weight522.1g /18.42 oz
Approximate Weight522.1g /18.42 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 — but works fine if I squeeze it slowly. What's happening?

That's a BMS overcurrent trip triggered by motor-start inrush current. When you pull the trigger fast, the motor draws a sharp current spike before it reaches speed — on a new or cold pack, the BMS interprets that spike as a fault and shuts down the cell output. Run two slow-trigger cycles to let the BMS profile the motor's inrush pattern. After that, fast trigger pulls stop causing nuisance trips.

The drill bogs down and loses torque halfway through driving a screw — battery feels fine otherwise. Why?

That's voltage sag — the cell voltage drops under sustained current draw, and the tool loses power before the BMS trips. It's most noticeable on a partially discharged pack or when the slide-in contacts have built up resistance from debris or oxidation. Clean the battery contacts on both the pack and the tool with a dry cloth, then test again with a fully charged pack. If sag continues on a full charge, check that resting voltage reads 20V or above before use.

The pack gets hot during charging and the charger light never turns green. Is that a charger problem or a battery problem?

Heat during charging is normal up to around 45°C, but if the pack is too hot to hold and the charger stalls without completing, the thermal sensor inside the pack has flagged an over-temperature condition. Let the pack cool to room temperature — roughly 20°C — before reconnecting to the charger. If the charger then completes the cycle normally, the cell and charger are both fine. If it stalls again at room temperature, measure pack voltage — a reading below 15V on a "full" pack points to a cell imbalance the BMS cannot resolve through standard charging.

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