I saw this mod somewhere before and did mine. Here is my version.
Materials: ceramic fuses with 1/2" diameter (doesn't matter amperage), 2.5mm DC jacks (male and female), parallel cord with palorization marks, battery connectors, 6V AGM battery. I got the jacks, connectors and cords from another overdue electronic device. They are available at electronic stores or Radio Shack.
You can skip the DC jacks altogether and just connect the battery to the flash. If you can find mock AA battery housing, that'll be ideal. for the mod. I like it with DC jacks, so that I don't need to fumble with the polarization each time and easier for storage and transport.
***Warning: The polarization MUST be done correctly or you'll fry your flash or get burned or get injured or worse...***
Step 1: find out the polarization of the battery power, which is located on the back side of the flash. The postive (+) will be connected to the center of the DC jack and the negative (-) will be connected to the ground. It has to be consistant or will short the circuit.
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Step 2: This is how the fuses supposed to fit.
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Step 3: Solder the parallel cord to the (+) and (-).
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Step 4: I cut out some part of the battery holder for the wires to go through.
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Step 5: fit the battery connectors to the wires and solder the wires to the female DC jack. Again, make sure the (+) is connect to the center of the jack and (-) is connect to the ground.
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Step 6: install the battery pack into the flash.
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Step 7: close the battery door and leave them there for good. I could have cut out for the wires but decided to be lazy.
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Step 8: finish connection and you're good to go. The recharge time is about half of NiMH batteries.
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I ran out of English here. Please let me know if there's anything not clear to you.
