It's pretty easy to do, just connect the SLA battery to the camera. You can use "fake batteries", or you can do what I did, take the batteries out and solder wires directly to the PCB inside the flash. Fake batteries are probably a better bet.
Have a read of www.aljacobs.com
Yikes, I didn't know SLA batteries were so costly. I have no problem tearing apart my 283 (wouldn't be the first time... or the second... or the third, etc) so wiring it would be no problem.

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