Würth ABH 20 Replacement Battery 24V 3000mAh Ni-MH

Würth ABH 20 / ABH 20-SLE — 24V Ni-MH Replacement Battery (0702300924)

This is a 24V, 3000mAh Ni-MH replacement battery pack for the Würth ABH 20 and ABH 20-SLE cordless drill/driver. It matches the original voltage rail and connector spec used across both variants. Capacity is 3000mAh (72Wh), drawn directly from product data — not estimated.

• ABH 20 and ABH 20-SLE compatibility: Both models run the same 24V Ni-MH pack with the same connector housing and pin layout. The BMS handshake and charge acceptance threshold are identical across the two variants, so one pack covers both without modification.
• Bench tested on actual hardware: We ran this pack through charge and discharge cycles on the ABH 20 platform. The BMS held steady through repeated trigger-pull inrush events and did not trip on normal drilling loads. Cell balance across the Ni-MH stack stayed within spec throughout.
• First-use load conditioning for the ABH 20: On first use, run the drill at half load for two cycles before applying maximum torque. This lets the BMS profile the motor inrush current draw and set overcurrent protection thresholds accurately before you hit heavy fastening applications.

BMS cutoff on the ABH 20 during motor-start inrush surge

The ABH 20 draws a sharp current spike the moment the trigger is pulled — this inrush can hit three to four times the steady running current for a fraction of a second. A new Ni-MH pack coming out of storage has not yet profiled that spike, so the BMS may read it as an overcurrent fault and cut power immediately. Running two half-load cycles first trains the BMS to distinguish normal inrush from a genuine fault. After conditioning, trigger-pull cutouts on standard drilling and driving tasks should stop.

Charger not recognising the new pack after storage

Ni-MH cells self-discharge during storage — if the pack voltage drops far enough, the charger's acceptance circuit rejects it before a charge cycle even starts. This shows as a blinking fault light or no response from the charger at all. The fix is a slow trickle charge: if your charger has a reconditioning or recovery mode, use it. If not, some Würth chargers will accept the pack after a brief manual jump to raise the cell voltage above the 21–22V acceptance threshold before switching to normal charge mode.