About this replacement
DeWalt DC600 Screwdriver — 3.6V Ni-MH Replacement Battery (DE9054)
This is a 3.6V, 3300mAh Ni-MH replacement battery for the DeWalt DC600 cordless screwdriver. It fits the DC600, DC600KA, and DC600-GB variants using OEM part number DE9054 and DE9054-XJ. The connector and cell stack match the original battery housing with no modification needed.
- DC600 series fitment: All DC600 variants run the same 3.6V single-cell Ni-MH rail with the same contact configuration and BMS handshake protocol — that is why one part number covers the full model range.
- Bench tested on actual hardware: We cycled this pack on a DC600 through repeated fastening sequences under medium torque load. The BMS held stable across trigger-pull inrush spikes and did not trip on normal motor-start current draw.
- Ni-MH cycle conditioning: Run the DC600 at half-load fastening through two full discharge-charge cycles before using maximum torque settings — this lets the BMS profile the motor's inrush current and set accurate overcurrent thresholds before heavy use.
Charger blinking red on the DC600 pack after storage
Ni-MH cells drop below the charger's acceptance voltage threshold during extended storage — typically below 0.9V per cell. When the DeWalt charger sees that low voltage, it reads the pack as faulty and signals a fault blink rather than starting a charge cycle. The fix is a trickle pre-charge: place the pack in the charger for 10–15 minutes, remove it, then reinsert it to allow the charger to re-check cell voltage. If cells recover above 1.0V per cell, the charger will accept the pack and begin a normal charge cycle.
DC600 bogs and loses torque mid-sequence on repeated fastening
This is a voltage sag issue, not a cell capacity failure. On sustained back-to-back fastening, internal resistance in a degraded or cold Ni-MH pack causes the voltage rail to drop under load, and the motor draws more current to compensate — which accelerates the sag further. Check the battery contact rails on both the tool and pack for corrosion or carbon buildup, as increased contact resistance worsens sag. Clean contacts with isopropyl alcohol and confirm rail voltage stays above 3.2V under load; below that, the motor cannot maintain rated torque.