Modifying the Metz Power Pack for other Batteries

Ensure the power pack capacitor is fully discharged before proceeding.

Step 1

Unplug the flash head and measure the terminals at the end of the powercord with a voltmeter. A fully charged capacitor reads 360Vdc. To discharge the capacitor, insert a 10K~20K (10W) resistor into the terminals.

With the power capacitor discharged, remove the four screws at the top and slide out the power module completely. The power module is a self-contained unit. Set it aside for the time being.

Step 2

Now that the module is out of the way, you will have access to the two pins that lock the door retaining unit.

Use two small screwdrivers and press the two pins simultanously, at the same time gently pull the door retaining unit out.

Step 3

Snap open the unit and cut away all the wires.

Solder a two conductor extension wire to the pins according.

Terminate the other end of the extension wire with a 2-pin Molex type connector. 20awg or 18awg stranded wires are sufficient.


It is vital that the wires are soldered correctly. Note the location of the Pins for the respective wires.

The RED wire is for the Positive Terminal of the battery and the BLACK is for the Negative.


Snap the two pieces back together and reassemble the power pack.

With this simple modification, you can use the battery of your choice. For testing purposes, the Metz was connected to an alkaline 6V battery (top picture). Sealed Lead Acid can obviously be used but due to it's larger size, it will have to be external.

If you prefer to have the batteries inside the battery compartment, use 5 pieces of "C" or "Sub C" NiMH batteries connected in series. They will fit comfortably with space to spare.

Regardless of what type of batteries are used, it is vital that the voltage is 6V. A higher voltage WILL result in permanent damage to the power pack.

Battery Recharging

The Metz battery charger is disconnected with this modification.

To recharge the NiMH or SLA, disconnect the battery from the power pack and recharge the battery with a Smart Charger.


Michael Chua takes no responsibility for any loss, injury or death howsoever caused resulting from, whether directly or indirectly, the reader's inability to understand and appreciate the hazards of household mains or other voltages as may be applicable to any published material. All mains wiring should be performed by suitably qualified persons only.