BLF Interest list for Very High Current Beryllium Copper springs Pt1(ENDED)

UPDATE

Pics

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.

Sixteen big and twelve small for me.

Updated again.

We are up to 736 big springs, and 117 small springs.

We are getting close :beer:

I’m in for 10 smaller springs. Thanks :+1:

Added to the list.

@chatika, there is actually a reason for the top of the spring being larger than the bottom.

This is to allow smaller cells to have contact with the spring, that’s all. It also looks better for some reason than a symmetrical spring.

Interested in 20 large, and 10 small, if they prove to perform well.

Put me in for 15.

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.

Please add 30 small springs for me and 10 big, so 30 of each in total.

Is the FastTech carobronze 4mm top diameter? ∅7mm of base, 10mm in height. This info in the opening post would be wise.

I'd like to wait a bit for the resistance test measurements, will them be soon?

Cheers ^:)

How easy is it to replace the springs in the Q8? If it’s easy for someone with not that much soldering experience, I’ll buy a set for the Q8.

I’d be in for 20 Large and 10 small please…

Put me in 20 Large and 10 small. Thanks.

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… :smiley:

The height when fully compressed is 4mm.

@Barkuti, I have asked for a sample of 10 springs to the manufacturer, and there being a holiday, I have not seen a response yet.

50 Large
30 Small
.

Thank you!! :+1:

Updated.

@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.

I’m interested in 20 large springs and 20 small springs. Thanks BlueSwordM!