About this replacement
Panasonic EZ3570 / EZ6700 Series — 12V Ni-MH Replacement Battery (EZ9001)
This is a 12V, 1500mAh Ni-MH replacement battery for the Panasonic EZ3570, EZ6700, EZ6701, EZ6802, and over 58 compatible drill/driver models. It replaces OEM part numbers EZ9001, EZ9006, EZ9101, EZ9102, EZ9106, EZ9107, EZ9200, and EZ9200S. Voltage and connector match the original pack exactly.
- EZ3570 / EZ6700 series compatibility: These models share the same 12V rail, battery housing dimensions, and contact configuration. The BMS handshake protocol is identical across the range, so one pack covers the full group without modification.
- Bench tested on actual hardware: We ran this pack on an EZ3570 and logged the BMS response across multiple trigger pulls. The overcurrent protection threshold held steady at motor-start inrush, and cell voltage recovery between pulls was consistent across the test set.
- Break-in procedure for Ni-MH cells: On first use, run the drill at half load for two full cycles before applying maximum torque. Ni-MH cells need a few charge/discharge cycles to reach rated capacity — pushing maximum load immediately on a new pack compresses that break-in window and can cause early voltage sag.
BMS cutoff on motor-start inrush in the EZ3570
When you pull the trigger on a 12V drill, the motor draws a brief current spike — often three to five times the running current — before it reaches operating speed. On a worn or deeply discharged pack, that spike can push cell voltage below the BMS cutoff threshold, which trips the protection circuit before the motor even starts. This replacement pack uses cells rated for the inrush demand of the EZ3570 motor. If cutout still occurs after installation, check the rail contacts on the tool body for oxidation — resistance at the contacts amplifies voltage drop during inrush.
Charger not recognising the new pack after storage
Ni-MH packs sitting in a warehouse can self-discharge to a point where some chargers refuse to begin a charge cycle. The charger reads the low cell voltage as a fault condition rather than a depleted pack. If the charger blinks or shows no activity, place the battery in the tool and pull the trigger briefly — even one short burst draws enough current to shift the cell voltage into the charger's acceptance window. Then seat the pack back on the charger. Most Panasonic chargers accept the pack once cell voltage clears approximately 1.0V per cell.