That’s my issue as well, I’ve got some parts on my cart for a few weeks but the shipping cost is nearly half the price of the parts.
Thank you Simon, you are great. I received them today and installed two of them in my Mateminco lamps. They’re much better than the factory ones, they avoid accidental activation in the pocket and are nicer too. You really should upload them to your store, I think a lot of people would need them.
Hello Simon, I am looking for a MOSFET driven remote switch not to loose too much brightness with the internal resistance of the long wires. is it something you can make or know someone that sells some?
thank you 
Do not pay after placing the order, I will remove the shipping charges.
I didn’t think it could be used on other brands of flashlights.
This requires the use of very thick copper wire.
You need a lot of strength to stretch spring-cable.
That’s why I’d like not to put all the amps though the remote wires but use a MOSFET embedded in the flashlight tail, the MOSFET being the flashlight Switch and the remote switch being the MOSFET switch
hey simon, is the T3 titanium compatible with T3 copper? Can you swap the head?
Are the T3 driver a 13 group with 100%-20% mode?
Sorry, I didn’t produce additional metal parts. The threads are the same. Currently Group 10 is 20–100
Simon, any update on the 17mm 6V boost driver and Ti S2+? Do you think it will be available around Jan/Feb?
On the T3 titanium version, there's a 13 group driver with the 100%-20% mode (on 12 Group if I remember correctly).
Is it wrong on the aliexpress listing?
Ps. If the CU and Ti T3 version are compatible, consider doing a CU-Ti T3 version, I wonder how popular it would be.
I would buy a T3 copper head (driver + led and gaskets) for my T3 titanium if you have it available.
Simon
How’s the 3x21a highter output driver plan going ?
Hi Simon. Order is placed. Looking forward to finally pay.
Good to see that your copper S2+ beauties are back (while they last) Simon!
If I didn’t buy them with your scratch and dent sale last summer, I’d be all over these. I removed the coating on my textured copper and it turned out to be my favorite S2+ color.
Hi folks and Simon!
@ folks
I have some questions for you, I hope some people can help on this.
1) How good are these cells? Did anyone buy and use them?
INR21700 5000mAh lithium battery 21700 50E - https://www.aliexpress.com/item/1005004982166747.html
2) Should I get those above or the LiitoKala?
LiitoKala Lii-50E 21700 5000mAH lithium battery - https://www.aliexpress.com/item/1005002311598364.html
3) To charge the 21700 cells I want to buy I need a “dedicated” 21700 charger. Is this one good or should I pick another one? If so, any suggestions?
Liitokala lii-S2 Liitokala Lii-S2 Double slot 18650 Battery Charger - https://www.aliexpress.com/item/4000090139954.html
4) Has anyone used this retaining ring in a Convoy S21A in order to use a 17mm driver? Do you have any pros or cons in its use?
20mm to 17mm brass ring adpater for S21A - https://www.aliexpress.com/item/33023608406.html
@ Simon Mao
Do you ship batteries regularly to European countries (Portugal) or are there any restrictions or should I mention something about that when making the order?
Thanks in advance for any replies on these questions 
Why not buy from Nkon, they have high quality cells from top manufacturers and chargers, it shouldn’t cost more shipping included and it will arrive faster.
Honestly, when I bought from Nkon, I paid 16€ for the 3 cells I bought and 11€ for the shipping, so…it is not the best deal for me.
For the same amount of money I can buy more things from Simon store or other AliExpress stores with the same quality.
And actually, I had things arriving faster from China (with normal shipping) than those that came from NKON.
FYI MascaratumB, the 2 battery links don’t work for me.
I just charge my Samsung INR21700 50Es in my Opus BT-C3100 charger.
Maybe it has something to do with the AliExpress page configuration?
I will try differently:
INR21700 5000mAh lithium battery 21700 50E
LiitoKala Lii-50E 21700 5000mAH lithium battery
As for the charging, I tried the Opus BT-C3100with the Vapcell T50 and it works but I’d like to have one charger just for the 21700s, while the Opus I normally use for the other cells.
I didn’t realise that shipping to Portugal was that much higher.