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You can check out the theory of battery voltage dropping too much during a shot just by using MF where camera battery current consumption will be very low if a hot shoe flash is used. There's only 2 things things that gobble up current from camera batteries, AF and the popup flash.
Another thing, you can always tell if P-TTL is working and there's power left in hand (a prerequisite for P-TTL to work properly) from the recycle times. If the flash is taking a few seconds to recycle then you're in trouble with any TTL type of system.
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