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Continuous positive?

How about some ribbon wire and few layers of kapton inside the battery tube, like how they do it with protected batteries? This may be too "hacky," but would allow you to get your + feed back to the driver.

What about small drivers that can fit in the back end of an aixiz module, do you have room for that?

Sometimes, drivers don't like having their loads too far away from them. I dunno why, I ain't too good at 'lectronics

Yes, I have also seen copper foil used as RF shielding. You could line the inside with a layer
of thin tape (like Kapton), then foil, then more tape. It would also add capacitance on the
input which is usually a good thing. On the ends then solder a wire on so it makes a
connection with high surface area.
 







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