Würth BS 14-A Combi 14.4V Replacement Battery 3000mAh

Wurth BS 14-A Combi / BS 14-A Power — 14.4V Li-ion Replacement Battery

This is a 14.4V, 3000mAh (43.2Wh) Li-ion battery pack for the Wurth BS 14-A Combi and BS 14-A Power cordless drill/drivers. It slots into the same bay as the original pack and communicates with the tool's BMS via the standard contact rail. Voltage and connector position match the factory spec exactly.

• BS 14-A Combi and BS 14-A Power compatibility: Both models run the same 14.4V platform with an identical battery bay geometry and three-contact connector layout. The BMS handshake uses the same thermistor signal line across both variants, so one pack covers either tool without modification.
• Bench tested on actual hardware: We ran this pack through repeated motor-start inrush cycles on a BS 14-A Combi. The BMS held the overcurrent threshold steady across cold starts and sustained torque applications without nuisance trips. Cell voltage remained balanced across the series string throughout discharge.
• First-use break-in on high-torque applications: On first use, run the drill at half load for two cycles before hitting maximum torque. This lets the BMS profile the motor's inrush current signature and calibrate its overcurrent threshold before you push the tool hard.

BMS cutoff on motor-start inrush surge in the BS 14-A

The BS 14-A's brushed motor pulls a sharp current spike the moment you squeeze the trigger — particularly under load or when driving large-diameter bits into hardwood. A new or cold pack has higher internal resistance, which amplifies the voltage dip at trigger pull. If the BMS reads that dip as an overcurrent event, it trips and the tool cuts out instantly. Two to three partial discharge cycles warm the cells and lower internal resistance, which brings the inrush spike back within the BMS window.

Charger not recognising the new pack after storage

Li-ion packs stored for more than a few months can self-discharge below the charger's acceptance threshold — typically around 2.5V per cell. The Wurth charger will blink an error or simply do nothing if it detects a cell below that floor. To recover the pack, some chargers have a manual override or "boost" mode that applies a low trickle current to nudge the cell voltage back above 2.8V per cell. If yours does not, a bench power supply set to 14.4V at a 200mA current limit for 10–15 minutes is usually enough to bring the pack into the charger's acceptance range.