Come to think of it I don’t think I’ve ever seen powered pikes... Halberds, yes, but not pikes. It’s probably hard to balance a very long spike with some sort of meaty looking power pack.
If I was to do it, I would run some guitar wire from a nice sci-fi backpack into the shaft of the pike, or some thin wire from the pack into a coil around the top half of the shaft up to the point.