About this replacement
DeWalt DCD740 / DCD780 Series — 20V Li-ion Replacement Battery (DCB182)
This is a 20V Li-ion battery rated at 2600mAh (52Wh), built to fit the DeWalt DCD740 and DCD780 compact drill/driver platforms along with a wide range of compatible 20V MAX tools. It replaces OEM packs DCB182, DCB183, DCB184, and other compatible part numbers in that family. The slide-on form factor and onboard BMS match the original pack's communication protocol with DeWalt 20V MAX chargers.
- DCD740 / DCD780 platform fit: Both drill models run the same 20V MAX slide-rail connector and share identical BMS handshake requirements. This battery seats and latches the same way as the factory pack, and the charger recognition sequence runs without modification on DCB107, DCB112, DCB115, and DCB118 chargers.
- Bench tested on actual hardware: We ran this pack through repeated motor-start inrush cycles on a DCD780 under torque load. The BMS held the overcurrent threshold steady across cycles without nuisance tripping, and cell voltage recovered cleanly after each high-draw pulse.
- Break-in on first two uses: Run the drill at medium speed and light fastening loads for the first two charge cycles before driving large-diameter bits at full torque. This lets the BMS profile the inrush signature of your specific motor before locking its overcurrent protection thresholds.
BMS cutoff on DCD740 motor-start inrush surge
When you pull the trigger on a stalled or heavily loaded bit, the motor draws a short current spike that can be three to five times the steady-state draw. A BMS that hasn't profiled that inrush pattern may read it as a fault and cut output before the bit starts turning. On the DCD740, this shows up as a dead trigger pull with the tool LED off. Letting the BMS calibrate over two light-load cycles before maximum torque use eliminates most of these false trips.
Charger blinks red on this pack after storage
If a Li-ion pack sits unused for several months, cell voltage can drop below the charger's acceptance threshold — typically around 10V for a 20V pack. The DCB112 and DCB115 chargers respond with a red fault blink rather than starting a charge cycle. Leave the pack on the charger for 30 minutes without removing it; most DeWalt chargers include a recovery trickle mode that brings cells up to 12–13V before switching to normal charge. If the light stays red beyond 45 minutes, measure the pack terminals — anything below 8V indicates a cell that won't recover.