About this replacement
Bosch GSR 9.6-1 / GSR 9.6-2 Series — 9.6V Ni-MH Replacement Battery (2 607 335 707)
This is a 9.6V, 3000mAh Ni-MH replacement battery for the Bosch GSR 9.6-1 and GSR 9.6-2 cordless drill/drivers. It also fits the GDR 9.6V and GSR 9.6V platforms. Cross-references include BAT100, BAT119, BAT048, and over a dozen Bosch OEM part numbers listed in the product data.
- GSR 9.6 platform fit: All models in this group share the same 9.6V slide-in battery format, connector pin layout, and BMS handshake protocol — that's why a single cell pack covers the GSR 9.6-1, GSR 9.6-2, GSR 9.6V, and GDR 9.6V without modification.
- Bench tested on actual hardware: We ran this pack through full charge and discharge cycles on a GSR 9.6-1 chassis. The BMS responded correctly to motor-start inrush current and held voltage through sustained fastening loads without tripping overcurrent protection.
- First two cycles — break-in under load: Run the drill at half load for the first two cycles before applying full torque. This lets the BMS profile the motor's inrush current draw and calibrate overcurrent thresholds before you hit maximum torque applications.
BMS cutoff on GSR 9.6 motor-start inrush surge
When you pull the trigger on a cordless drill, the motor draws a spike of current far above its running load — this is inrush current. On Ni-MH packs, a BMS that hasn't profiled the motor yet may read that spike as a fault and cut the output instantly. The GSR 9.6-1 is particularly susceptible to this on cold packs or freshly installed batteries. If the drill clicks off on trigger pull, warm the pack to room temperature and run two partial-load cycles before full-speed drilling.
Drill bogs under load and feels underpowered mid-task
This is voltage sag — under sustained drilling load, cell internal resistance causes the voltage rail to drop below what the motor needs to maintain torque. On a 9.6V Ni-MH pack, sag becomes noticeable when rail voltage drops below roughly 8.5V under load. Dirty or corroded battery contacts increase resistance and accelerate the sag. Clean the pack and tool terminals with isopropyl alcohol, then check that the slide connector seats fully and locks with an audible click before dismissing the battery as faulty.