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Release catches are included in a design for one reason - they need to release something. In this case it turns out to be a giant battery pack. It's the size of a Claymore mine, and has an intricate moulded plug that forms the interior part of the pack.
In its turn, this sockets into the body of the flash generator box. That's an impressive plug, folks; 11 shielded contacts. I suspect it is intended to pass an equally impressive amount of electricity. With this in mind, I Googled up what a Pro-B4 actually does:
Up to 1/25,000 sec flash discharge.
3 shots per second.
1000 watt/second power out.
Fan cooling.
500 watts available for modelling lights.
200-50,000 flashes per charge depending upon power drawn by the heads.
45 minutes to charge from the AC adapter.
2 lines out.
USB port for Profoto control software and apps.
9.8 Kg weight.
This is not your entry-level speedlght, folks. This is studio power out in the boonies where there is no electricity, and enough of it to do a full professional shoot. This is the sort of black box that earns its price back in a few years and then goes on to enrich you. It's not the sort of thing you buy or discard lightly - it's a genuine investment.
One that pays off...