Metabo BS 9.6 Replacement Battery 9.6V 2100mAh Ni-MH

Metabo BS 9.6 Series — 9.6V Ni-MH Replacement Battery (6.25471)

This is a 9.6V, 2100mAh Ni-MH replacement battery for the Metabo BS 9.6 cordless drill-driver range. It fits the BS 9.6, BS9.6, BSP9.6, and BSZ9.6 models, along with additional 9.6V platform variants. OEM part references include 6.25471, ME-974, and ME974.

• BS 9.6 platform compatibility: These drill models share the same 9.6V rail, connector geometry, and BMS communication protocol. A single battery format covers the full BS 9.6 line without modification or adapter.
• Bench tested on actual hardware: We ran this pack through charge and discharge cycles on the BS 9.6 platform. The BMS accepted full charge without fault flags and held voltage through repeated trigger-pull inrush events at the motor start threshold.
• Motor inrush conditioning: On first use, run the drill at half load for two cycles before applying maximum torque. This allows the BMS to profile the motor's inrush current draw and set overcurrent thresholds accurately before demanding work begins.

BMS cutoff on BS 9.6 motor-start inrush surge

When you pull the trigger on a cordless drill, the motor draws a spike of current — often three to five times the running current — before the bit starts turning. On a Ni-MH pack with a tight overcurrent threshold, this spike can trip the BMS and cut output instantly. The BS 9.6 BMS sets its trip point based on the first few inrush events it sees, which is why conditioning on lighter loads matters. If cutout persists past the first two cycles, check that the terminal contacts on both the battery and the drill are clean and making full surface contact.

Drill bogs under load but doesn't cut out completely

Voltage sag under load is the cause here — the battery voltage drops under sustained draw, reducing torque before the BMS hits its low-voltage cutoff. On Ni-MH cells this is often worsened by high contact resistance at the terminal rail, not cell failure. Remove the battery, clean the contacts on both the pack and the drill with isopropyl alcohol, and check for corrosion or mechanical wear on the spring contacts. If sag continues after cleaning, measure open-circuit voltage — a healthy pack at full charge should read at or above 10.8V.