Panasonic EZ907 9.6V Ni-MH Replacement Battery 2100mAh

Panasonic EZ907 / EZ595 — 9.6V Ni-MH Replacement Battery

This is a 9.6V, 2100mAh Ni-MH replacement battery for the Panasonic EZ907 and EZ595 cordless drill/drivers. It slots into the same battery bay as the original Panasonic pack and restores full tool function. Capacity is rated at 20.16Wh.

• EZ907 and EZ595 compatibility: Both models run the same 9.6V battery platform with identical connector geometry and cell count. The BMS handshake uses the same voltage thresholds across both drill variants, so a single pack serves either tool without modification.
• Bench tested on actual hardware: We cycled this pack through motor-start inrush sequences on the EZ907 and monitored cell voltage under load. The BMS held stable through repeated trigger pulls without tripping overcurrent cutoff at rated torque.
• Break-in on Ni-MH packs: Run the first two charge cycles at half-load drilling applications before pushing maximum torque. Ni-MH cells reach full capacity after two or three full charge-discharge cycles — the first pull on a fresh pack will feel slightly softer than normal.

BMS cutoff on the EZ907 motor-start inrush surge

The EZ907 draws a sharp current spike the instant the trigger closes — inrush can run four to six times the steady-state draw for the first 50–100 milliseconds. On a degraded or deeply discharged pack, the BMS reads that spike as an overcurrent fault and cuts the output rail immediately. This looks like a dead battery but the pack often recovers after a two-minute rest. A fresh, fully charged Ni-MH cell holds enough voltage headroom to absorb that inrush without tripping the threshold.

Tool bogs under load even with a charged pack

Voltage sag during sustained drilling means the cells can't deliver current fast enough to maintain the motor's speed under torque. On Ni-MH packs, this usually points to high internal resistance — either from age, shallow cycling, or poor contact at the battery terminals. Check the terminal contacts on the tool body for corrosion or debris and clean with isopropyl alcohol. A healthy pack at full charge should hold above 9.0V under moderate drill load — anything dropping below 8.4V mid-use points to a cell resistance problem.