So, I’m here again guys with the BeCu spring groupbuy interest list.

Only this is for the Part 2 GB with upgraded silver plated BeCu C17530 springs, instead of nickel plated springs. Just by doing that, we will be gaining a 5% increase in conductivity alone, which is nice, along with much better contact resistance. So that means even better spring for high current applications.

Here are the specs of both the small and large springs:

Small spring:
Material: Beryllium Copper C17530 38% IACS
Spring upper diameter: 4,00mm
Spring base diameter: 5,5mm
Spring thickness: 0,8mm
Spring height: 10,5mm
Total number of coils: 5
Plating: Silver electroplating

Large spring:

Material: Beryllium Copper C17530 38% IACS
Spring upper diameter: 6mm
Spring base diameter: 9mm
Spring thickness: 1,0mm
Spring height: 12mm
*Total number of coils: 4 *
Plating: Silver electroplating

And some pics of the springs if you want to know about them (nickel plated springs used for reference, and credits to Kit Latura for the pictures!)

And the real marvel of the show, a dual spring array:

And my work with it on a modded BLF Q8 tailcap:

Oh boy, these can sustain some very high currents of 20A+! Some of our top modders(DB Custom) put them in his Sofirn Q8 458 HAM’R, and he didn’t even need bypasses to get 21A out of each Honestly, even I wasn’t expecting it to go this far

And other notable advantages:

1. Stupid easy solderability. As quoted by DB Custom and contactr, these springs are so easy to solder to it makes it tempting to use spring bypasses with them, which was surprising.
2. High stiffness. Allows the use of short 18650/26650/21700 cells in series. Very nice.
3. No more need for bypasses with dual BeCu springs. Well, most of the time anyway

So, some info on pricing:

0,39$US/spring, either large or small
5$ US shipping internationally + 1,05 PP Fee

(0,39$US x number springs)+5$US shipping) x1,05 PP Fee = Final price

Just an experiment to see the interest for high CRI LEDs. Will include some more choices later on, like rosy tinted LH351Ds perhaps

I’m just searching for interest for good rosy tint binned LEDs so we can negotiate with bulk sellers like Digikey and Arrow.

For the LEDs, the shipping price of 5$US should be the same.

SST-20 4000k 95CRI

SST-20 3500k 95CRI

SST-20 3000k 95CRI

That is all for now. Put your interest numbers by posting down below, either for the springs or the LEDs.

UPDATE 1

The tint and flux bins of the 3500k and 3000k versions have been confirmed:

3500k: J4 Flux bin, GA3tint bin confirmed, below BBL line!
3000k: J2 Flux bin, HD2/HA4 tint bin confirmed, below BBL line!

UPDATE 2

Google Drive link for spreadsheet:
https://docs.google.com/spreadsheets/d/18SyWGP08EpK5OOcv1vZbLokQGv1KojNW...