Double batteries always increase camera flash sync speed?
At faster shutter speeds, the top curtain starts coming down from the top of the frame before the bottom curtain has reached the bottom of the frame, so a single flash wouldn't illuminate the top or bottom of the image sensor.
High Speed Shutter (HSS) gets around this by using multiple flashes, each occuring when the curtains are at different positions during their travels.
Adding a battery doesn't affect that.
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