About this replacement
DeWalt DC750KA / DC855KA Series — 9.6V Ni-MH Replacement Battery (DE9036 / DE9062)
This is a 9.6V, 1500mAh Ni-MH replacement battery for DeWalt 9.6V cordless drills and drivers. It fits the DC750KA, DC855KA, DW050K, and compatible models using the DE9036, DE9062, DW9062, and related OEM part numbers. Check your original battery's part number against the full compatibility list before ordering.
- DC750KA and DC855KA platform: These drills share the same 9.6V slide-pack connector and cell configuration. The BMS handshake uses the same thermistor signal line, so one cell pack covers the full range of compatible models without adapter modifications.
- Bench tested on actual hardware: We ran this pack on a DC750KA under repeated trigger-pull cycles. The BMS held steady through motor-start inrush current and did not trip on cold starts at room temperature. Cell voltage balanced correctly across the charge cycle.
- Ni-MH break-in on high-torque drills: On first use, run the drill at half load for two cycles before applying maximum torque. This lets the cell chemistry stabilise and allows the BMS to profile inrush current draw before setting overcurrent protection thresholds.
BMS cutoff on DC750KA motor-start inrush surge
When you pull the trigger on a 9.6V drill, the motor draws a short inrush spike that can be three to five times the running current. On a new or cold Ni-MH pack, the BMS may read this spike as an overcurrent event and cut power before the motor reaches speed. This is more likely if the pack has been sitting in storage and the cells haven't been conditioned. Running two light-load cycles first reduces the spike the BMS sees on subsequent high-torque starts.
Charger won't recognise the pack after storage
DeWalt 9.6V chargers check cell voltage before starting a charge cycle. If the pack sat discharged for weeks, individual cells can drop below the charger's acceptance threshold — typically around 0.9V per cell. The charger blinks an error and won't begin. To recover, briefly connect the pack to a compatible charger in "soft start" mode if available, or use a known-good pack on the same charger first to confirm the charger itself is functional. Once cell voltage is nudged above the acceptance floor, normal charging resumes — target at least 1.0V per cell across all ten cells.