Gentlemen,
I didn’t abandon my own thread, that would be rude. I was out doing photography in an area that doesn’t have cell service… No texts, no internet, no phone. God, it was wonderful looking up and observing Perseid meteorites…
I understand and appreciate everything you’ve said, but I would imagine that contact resistance would be more of an issue that spring resistance. Only the smallest part of the spring actually touches the battery. I would rather see a pair of concentric springs than a single bypassed spring. Concentric springs would be less resistive, but the real benefit of concentric springs would be more spring in contact with the battery.
Bypassed spring may be more harmful than helpful. Consider that the bypass wire may cause axial misalignment between the spring and the battery. Less of the spring contacts the battery = increased contact resistance = more heat = loss of efficiency.
My profession requires that I use a good LCR meter. When I get a chance I’ll measure the resistance of several springs taking a 4-wire bridged measurement.
I appreciate the information and comments presented here, but I’m still a non-believer, until I prove that spring resistance results in a meaningful loss of efficiency.
Cheers