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hippy
Have you got TT bars on your gravel bike for the long endurance races?
If so, depending on shape you could just stuff a fully charged battery in each TT extension, and connect them to the rest via a Junction A around the stem. When one is empty, plug out and plug in the other one. No need to stop :)
Here's the described setup, but only with 1 battery on my TT bike. O-ring & electric tape in layers around battery body until its a nice and snug fit.