The big spring is equivalent to the spring I have sent a diagram and measurements to the spring supplier. It is equivalent in size to the BLF Q8 spring, except that the bottom diameter will be smaller by 1mm to accommodate almost all tail caps and switch boards.
The small spring is the Fasttech Carobronze one just for comparison.
Once I get my sample of Beryllium Copper 38% IACS springs, I will compare all of the springs and compare their conductivity. If they are good, then the groupbuy will commence!
Also, if there is enough interest for the smaller driver side spring, I will ask the manufacturer to make a batch for it.
Most batteries have a large enough anode to ensure contact with the 5mm spring.
Anyway. Please change my numbers into (for now) 50 large and 40 small springs.
A thought: conical springs, well designed, can be compressed almost flat without becoming coil-bound. These ones don’t look as if they can do that. Hopefully not a problem in this application. What is the height when fully compressed ?
Coil bind could be a possible safety feature with some combinations of driver depths, driver retainer rings and large battery contacts, like some 26650 flat tops, my Cometa comes to mind…
@Barkuti again, thank you. I will add the Fasttech Carobronze spring info on the OP.
Edit: I have also added the small springs measurements.
Edit 2: Spreadsheet has been updated.
We are at 812 big springs at 257 small springs.
I will ask the manufacturer if it is possible to make 1000 big springs, and 500 small springs. So we can get all of our springs at the same time :laughing:
Well, this is what I am probably going to do once I receive my testing samples and test the voltage drop at 6A.