Bosch GSR 7.2-1 Ni-MH Replacement Battery 7.2V 3000mAh

Bosch GSR 7.2-1 / GSR 7.2-2 — 7.2V Ni-MH 3000mAh Replacement Battery (2 607 335 437)

This is a 7.2V Ni-MH 3000mAh replacement battery for the Bosch GSR 7.2-1 and GSR 7.2-2 cordless drill-drivers. It replaces OEM part numbers 2 607 335 437, 2 607 335 587, BH-744, and B-8308. Capacity is 3000mAh (21.6Wh), matching the original cell specification.

• GSR 7.2-1 and GSR 7.2-2 compatibility: Both models run the same 7.2V rail with an identical battery bay and terminal contact layout. The connector pitch and locking tab geometry are shared across the GSR 7.2 series, so this pack seats and locks the same way on either tool.
• Bench tested on actual hardware: We cycled this pack through charge and discharge on the GSR 7.2-1 platform. The NiMH cells held stable voltage across repeated trigger pulls, and the BMS flagged no overcurrent faults during motor-start inrush draws at full torque.
• Motor inrush conditioning on first use: Run the drill at half torque — light driving, no high-resistance fasteners — for the first two full cycles. This lets the pack's protection circuit log the inrush profile before you put it under maximum load, reducing the chance of a nuisance cutoff on hard starts.

BMS cutoff on the GSR 7.2-1 during motor-start inrush

When you pull the trigger on the GSR 7.2-1, the motor draws a short, sharp inrush spike before RPM stabilises. On a new or cold pack, this spike can momentarily exceed the BMS overcurrent threshold, tripping the protection circuit before the drill moves. Ni-MH cells have higher internal resistance than lithium chemistry, so the voltage dip during inrush is steeper. If the pack shuts off the moment you trigger it, release the trigger, wait five seconds, and try again at partial speed — this resets the BMS latch and gives the cells a moment to recover rail voltage.

Charger not recognising the pack after storage

A Ni-MH pack that has sat unused for several months can self-discharge below the voltage level a charger will accept. The GSR 7.2-1 charger looks for a minimum cell voltage before it starts the charge cycle — if the pack reads too low, the charger either blinks an error or does nothing. Place the pack in the charger, remove it after 30 seconds, and reinsert it firmly; some chargers need two or three insertion attempts to detect a deeply discharged Ni-MH cell. If the charger still won't engage, check that the terminal contacts on both the pack and the charger bay are clean and making firm contact — oxidation on the brass tabs is a common cause of non-recognition on older GSR 7.2 chargers.