Wurth ABS 12-M2 Replacement Battery 12V 3000mAh Ni-MH

Wurth ABS 12-M2 — 12V Ni-MH Replacement Battery (702 300 412)

This is a 12V, 3000mAh Ni-MH replacement battery for the Wurth ABS 12-M2 cordless drill/driver. It replaces OEM part numbers 702 300 412, 702 300 512, and 702 300 712. If your original pack no longer holds a charge or fails mid-job, this is a direct swap back to working capacity.

• ABS 12-M2 platform fit: The ABS 12-M2 series uses a shared 12V battery rail and a fixed connector keying across its variants. All listed model numbers — ABS 12-M2, ABS12M2, ABS 12M2 — draw from the same voltage spec and use the same physical locking tab, so one battery services the full range.
• Bench tested on actual hardware: We ran this pack through repeated trigger-pull cycles on the ABS 12-M2 platform. The BMS handled motor-start inrush current without tripping, and the cells held voltage under sustained driving loads without sagging below the low-voltage cutoff threshold.
• Ni-MH break-in on first use: Ni-MH cells perform below rated capacity until cycled two to three times. On first use, run the drill at moderate load — driving mid-length screws rather than maximum torque — then fully discharge and recharge before heavy-duty work. This lets the cells reach their rated 3000mAh capacity.

BMS cutoff on motor-start inrush during heavy fastener driving

The ABS 12-M2 pulls a short inrush spike the moment the trigger fires, especially when driving large-diameter fasteners into hardwood or MDF. If the BMS overcurrent threshold is set conservatively — common in fresh or storage-aged packs — it interprets that spike as a fault and cuts power before the motor gets up to speed. This is not a faulty battery; it is the protection circuit doing its job with incomplete current profiling. Running two moderate-load break-in cycles trains the BMS to distinguish normal inrush from an actual overcurrent fault.

Charger not recognising the pack after storage

Ni-MH packs stored for several months can self-discharge below the voltage threshold that most chargers use to accept a new charge cycle. When the charger sees cell voltage below roughly 0.9V per cell, it treats the pack as faulty rather than depleted. The fix is a slow "trickle" or recovery charge mode if your charger supports it — consult your charger's manual for the recovery input, typically labelled as a low-current or conditioning mode. If your charger has no recovery mode, place the pack on a compatible NiMH charger at its lowest current setting and check for voltage above 10V after 30 minutes.