About this replacement
Bosch GSR 9.6-1 / GSR 9.6-2 — 9.6V Ni-MH Replacement Battery (2 607 335 707)
This is a 9.6V, 1500mAh Ni-MH replacement battery for the Bosch GSR 9.6-1, GSR 9.6-2, GSR 9.6V, and GDR 9.6V cordless drill-drivers. It replaces OEM packs under part numbers 2 607 335 707, BAT100, BAT119, BAT048, and several others in the same family. When the original pack stops holding charge or drops voltage mid-job, this pack slots into the same bay and runs the same charger.
- GSR 9.6 series compatibility: The GSR 9.6-1, 9.6-2, 9.6V, and GDR 9.6V share the same 9.6V slide-in bay, connector pinout, and charge communication line. Any pack meeting those three specs works across all four platforms without modification.
- Bench tested on actual hardware: We cycled this pack through repeated trigger-pull inrush loads on a GSR 9.6-1. The BMS held through repeated clutch-engagement spikes without tripping, and cell voltage recovered cleanly after each load event.
- Ni-MH cycle conditioning on first use: On first use, run the drill at half load for two cycles before applying maximum torque. This lets the BMS profile the motor's inrush current draw and set overcurrent thresholds accurately before you hit full load.
BMS overcurrent trip on motor-start inrush in the GSR 9.6 series
When you pull the trigger on a Bosch GSR 9.6-1, the motor draws a current spike several times higher than its running draw — this is inrush current. A Ni-MH BMS that hasn't profiled the motor yet can read this spike as a fault and cut output instantly. On unconditioned packs, this trips the protection circuit before the motor has time to spin up. Running two half-load cycles first gives the BMS enough data to distinguish normal inrush from a genuine overcurrent event.
Tool bogs under load or feels weaker than the original pack
If the drill runs but loses torque under load, the cause is usually voltage sag — the rail voltage drops under current draw because of resistance at the battery contacts or degraded cell internal resistance. Clean the battery contacts on both the pack and the drill bay with isopropyl alcohol and check for corrosion or carbon buildup. Under moderate load, a healthy 9.6V Ni-MH pack should hold above 8.4V at the terminals. If voltage reads below that under load, the contact resistance is the first place to check before assuming the cells are at fault.