Sigelei 30W fix for loose battery...

[laidback4sho]

I ordered this thing when it first came out a few months ago and it works awesome! I do have one problem with it though, which can be easily remedied. It needs a spring inside the bottom cap.

Some of you may have this problem, others may not. See, the problem is, after a while of using it, the battery will become loose inside the body and it will sometimes lose contact. I fixed mine today with a spring from a ballpoint ink pen.

The spring is 0.159" in diameter, so i used a #21 drill bit, which is also 0.159" in diameter and drilled a hole 3/8" (0.375") down into the threaded post in the bottom cap for the spring to sit in. It fits in the hole nice and snug and pushes up against the battery, thereby making contact 100% of the time. The spring is about an inch long, so i just cut mine in half to shorten it.

You're welcome, internet.

 

[Katmar]

Nice idea. Thanks for sharing!!!

 

[Vapre]

Guys just so you know, I've discovered the little problem with mine.

The top cap moves!

What the tank abuts against, that cap, contains the connector. That is just pressed fit on top of the metal body housing. It presses down on the vertical sx300 board, which again presses down on the positive connector of the battery Bay. None of these are fixed.

So what happens is, as you tighten the bottom, at first there's good contact, but as the pressure slowly exerts itself from the positive pin, THROUGH the sx300 board (yeah I know, terrible design) pushing up against the press fit cap the whole thing slowly pushes up.

That's why at first flat top batteries work, but soon loses good contact. Then you go button top, but over time that happens too.

If you don't believe me screw a tank on. Then gently try to pull the tank away from the body rocking back and forth a little. You'll find the whole thing comes off.

To remedy, you might want to glue the top cap into place, pressing down from the top all the way it'll go. After that, you can exert more pressure while screwing the bottom on to get a good connection. Not too much though, yiu don't want to crack the sx300.

One last thing - some vtc5's you buy come prewrapped with button tops. Your mileage may vary, but I find that the wrapping doesn't provide the best connection. How I know this is that when I tighten, I notice maybe 0.6v drop when firing. But when I tighten more, it drops by only 0.2v. This tells me the button top and/or the bottom add-on, is not making good connection. My advice would be to remove that if you can.

With the top pushed all the way in, flat tops are perfectly fine with room to spare too.

 

[laidback4sho]

yeah, i had a problem with my top cap coming off too. i used a little dab of gorilla glue and it's decent again. and you're right, poor design for a 119 dollar mod. i'm surprised more people aren't commenting on these design flaws. guess they just haven't had them long enough for these problems to show themselves. but other than that, the thing does deliver. use mine every single day.

 

[WhatDoesThisButtonDo]

I notice that the bottom cap on mine (where it screws into the mod to push the battery up) gets super hot sometimes when firing. It seems to happen randomly, shouldn't be doing that.

And it took about two months of having this thing for the positive pin to finally give in under pressure, but now it's happening. I don't think it'll take my flat top batteries much longer.

***update***

If you have the bottom cap with a brass pin contact on the screw.... that brass pin itself can be screwed to protrude out further and thus push the battery even further up. It's a temp fix if the positive pin KEEPS recessing, but still.