Panasonic EZ907 9.6V Ni-MH Replacement Battery 3300mAh

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

This is a 9.6V, 3300mAh Ni-MH replacement battery for the Panasonic EZ907 and EZ595 cordless drill/drivers. It slots into the same battery bay as the original pack and connects through the same terminal block. No OEM part number is listed — match your existing pack by voltage and form factor before ordering.

• EZ907 and EZ595 shared platform: Both tools run the same 9.6V battery bay and terminal layout. The connector pinout and cell count are identical across these models, so one pack covers both tools in your kit.
• Bench tested on actual hardware: We cycled this pack through charge and load pulls on the EZ907 platform. The Ni-MH cells held stable voltage through repeated trigger pulls, and the BMS handled motor-start inrush without tripping at standard drill loads.
• Break-in cycling for this drill: On first use, run the drill at half load — light drilling, no high-torque fastening — for two full charge-discharge cycles. This lets the BMS log the motor's inrush signature and set its overcurrent threshold accurately before you push maximum torque.

BMS overcurrent trip on trigger-pull inrush in the EZ907

When you pull the trigger on a Ni-MH drill, the motor draws a brief inrush spike — sometimes two to three times the normal running current. On a new or recently stored pack, the BMS hasn't yet mapped that spike, so it reads the surge as a fault and cuts output. The result is a tool that stalls or stutters on the first pull, then runs normally once the BMS recalibrates. Two break-in cycles at half load give the BMS enough data to set a realistic overcurrent threshold. After that, full-torque pulls should clear without cutoff.

Charger won't accept the pack after storage — green light never comes on

Ni-MH cells self-discharge during storage, and if the pack sits long enough, cell voltage drops below the charger's acceptance floor. Most Panasonic chargers for this platform require cells to read above roughly 0.9V each before initiating a full charge cycle. Below that, the charger sees a dead or shorted cell and refuses to start. To recover the pack, apply a slow trickle charge at 100–200mA using a compatible NiMH charger with a recovery or conditioning mode — hold it there until pack voltage climbs above 9V, then transfer to the standard charger.