Würth ABS 72M-2 7.2V Replacement Battery 2100mAh Ni-MH

Würth ABS 72M-2 — 7.2V Ni-MH Replacement Battery

This is a 7.2V, 2100mAh Ni-MH replacement battery for the Würth ABS 72M-2 cordless drill/driver. It slots into the ABS 72M-2 battery bay and restores power to the tool when the original pack can no longer hold a charge. Capacity is 15.12Wh.

• ABS 72M-2 platform fit: The ABS 72M-2 runs a 7.2V rail with a fixed connector geometry common to Würth's compact drill range. This pack matches that rail voltage and connector pinout — the BMS handshake initialises correctly on first insertion.
• Bench tested on actual hardware: We cycled this pack through repeated trigger pulls at full torque. The BMS tracked inrush spikes during motor start without tripping and recovered cell voltage cleanly between draws.
• Motor inrush conditioning: On first use, run the ABS 72M-2 at half load for two charge-discharge cycles before applying full torque. This lets the BMS profile the motor's inrush current draw and set its overcurrent thresholds accurately before you put the tool under maximum load.

BMS cutoff on motor-start inrush in the ABS 72M-2

The ABS 72M-2 draws a short, sharp current spike the instant the trigger is pulled — this is motor-start inrush. On a new or freshly charged Ni-MH pack, that spike can briefly exceed the BMS overcurrent threshold, causing the pack to cut out immediately on trigger pull. The BMS in this pack is rated to handle typical inrush from the ABS 72M-2 motor, but a cold pack or one fresh off a long storage period will show higher internal resistance, amplifying the apparent spike. Warm the battery to room temperature before use — cell resistance in Ni-MH packs drops measurably above 15°C and the BMS cutoff risk falls with it.

Charger not recognising the pack after storage

Ni-MH cells self-discharge during storage — if this pack has sat long enough, cell voltage may have dropped below the threshold the Würth charger uses to confirm a valid battery is connected. The charger checks for a minimum voltage on the terminals before it starts the charge cycle; a deeply discharged pack reads below that floor and the charger refuses to initiate. To recover the pack, place it in the charger and wait up to ten minutes — some chargers apply a trickle pre-charge pulse to raise the cell voltage before switching to full charge. If the charger still rejects the pack, confirm terminal voltage with a multimeter: a reading above 5.0V across the pack terminals means the cells are recoverable and the charger should eventually accept them.