Makita 678102-6 4.8V Cordless Drill Compatible Battery 3000mAh

Makita 6041D Series — 4.8V Ni-MH Replacement Battery (678102-6)

This is a 4.8V 3000mAh Ni-MH replacement battery for the Makita 6041D, 6041DW, 6043D, and 6043DWK cordless drill/drivers. It matches the OEM part number 678102-6 and fits the same battery slot without modification. Capacity is 3000mAh (14.4Wh) — sourced to match the original cell specification.

• 6041D and 6043D platform fit: All four models in this group share the same 4.8V battery rail, connector footprint, and BMS handshake protocol. A single battery type covers the full range — no adapter or wiring change needed.
• Bench tested on actual hardware: We ran this pack on a 6041D under repeated trigger cycles. The BMS handled motor inrush current correctly, held voltage through the pull, and released cleanly at end of discharge without locking the pack.
• Ni-MH break-in on first use: Run the drill at half load for the first two full charge-discharge cycles before using it at maximum torque. This lets the BMS profile the motor's inrush current draw and set accurate overcurrent thresholds — skipping it can cause premature cutoffs on hard fastening tasks.

BMS overcurrent trip on trigger pull in the 6041D

When you pull the trigger on a cordless drill, the motor draws a sharp inrush spike before settling into running current. On a Ni-MH pack at the 4.8V rail, that spike can exceed the BMS overcurrent threshold — especially if the cells are cold or the pack is new and unprovisioned. The BMS trips, cuts the output, and the drill goes dead mid-pull. The fix is to run two break-in cycles at reduced load so the BMS can calibrate its overcurrent window to the actual motor profile. After break-in, inrush trips on normal fastening tasks should stop.

Charger not recognising this pack after storage

Ni-MH cells self-discharge during storage, and if voltage drops below the charger's acceptance threshold, the charger refuses to initiate a charge cycle — often shown as a blinking or absent indicator light. This is not a faulty battery. A brief trickle charge or a compatible charger with a recovery mode can bring the cell voltage back above the acceptance floor. Once voltage crosses that threshold — typically around 1.0V per cell — the charger recognises the pack and begins a normal charge cycle. Use a charger with a recovery or conditioning function if the standard unit won't engage.