I bought the Duracell 28L which is a 6V cell compatible with L544 which is what the Canon New F-1 needs, not only for metering, shutter release but also for the operation of the whole motor drive mechanism. That's even if the motor drive is fully powered by 12 AA batteries, it won't release the camera shutter or wind the film transport forward at all. What it works, without the 6V battery, is
the meter and the rewind actually, surprise (I haven't actually tested with a film cartridge inside, but the rewind seems to work when the motor drive is not attached to the camera or when attached but quickly stop as the counter hits 0).
So the conclusion is the 1.2V AA rechargeable batteries do work with the motor drive even it's 1.2V not the 1.5V. The 6V L544/28L battery is required for the motor drive to operate. A depleted 6V battery enough to operate the meter and even the light but not enough to operate the shutter won't allow the motor drive to run. So you can't run the motor drive at all if your 6V in camera battery is depleted.
These are the quirks of the system I found.
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