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

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!

You’re welcome skinny_tie.

I do wonder though.

Why did Hank not make a bigger beryllium copper spring? He must know about the demand, no? Or does he think the spring would not sell well?

Or maybe it is just because that at the time the small beryllium copper spring was introduced, there were almost no lights which could take advanatge of their very low resistance except for the Noctigon Meteor?

Or maybe he did just think there was no market for a bigger spring.

Edit: There are a total of 841 big springs and 277 small springs.

If the small springs reach 500-600 springs, I will ping the manufacturer to make a batch of 1000 springs.

The group buy will continue for 3 weeks.

Is there something you guys think I should change about the big spring?

Would you prefer a gold plating instead, and a 1.1-1.2mm wire for even better conductivity? Or a smaller top?

Let me know.

Gold plating will make it corrosion resistant but, how much is that? Is it worth it?

1.2mm (≈1.131mm²) wire diameter will make it a little bit better conductor than AWG21 copper wire. :THUMBS-UP:

Cheers :-)

Yeah I don’t think it is worth it for the additional cost

I will ask if it is possible to use 1.2mm wire for the same cost or not. I don’t think it is going to cost more, if it will cost more at all.

At 1.2mm diameter though, that is going to be one tough spring.

40 + 20