I have an Olympus FL-36 flash, which is a fine unit but it does suffer from a rather long recycle time. When the batteries are fresh it's pretty quick, but as the power drains, the recycle time becomes unacceptable. One avenue to fix this is to get better batteries. I have a set of Maha Energy Immedion MiNH AA batteries on order. These are rated for 2400mAh and should be better than standard alkaline batteries. I'll report on this once I have the batteries and have run some tests. But my question is; has anyone tried using an external power source for a FL-36 or any other flash unit that was not designed for external power? I've read reports of using dowels to make a dummy battery that fits into a device needing AA batteries and then wiring them to an external souce. If I were to do this, why not connect them to a pair of Immedion D cells. These are rated at 1.2V and whopping 9500mAh. Clearly this would extend the number of times the flash would operate before needing fresh batteries, but would it improve the recycle time? Has anyone ever tried something like this?