DNA 40 with battery tube question

[ong.kelvin]

How do I connect the battery negative from DNA40 to a battery tube fitted into a wooden box mod. I have ordered myself a fat daddy vapes brass battery tube but don't see how the negative is suppose to connect to the tube bottom cap.
Also through Google I have come across a couple of high end mod internals without a battery negative connection.
Sorry if my question is elementary as I am still learning how to build myself a mod.

 

[xtwosm0kesx]

Looking at the pictures of the tube, and assuming you want to keep the bottom cap able to unscrew for easy battery access, i would say the only option is to solder the negative to the outside of the tube itself, though to do so is going to require a decent amount of heat. You may be able to get a small area of the tube hot enough for solder to stick using a very wide soldering tip, other wise it may take a few seconds with a torch.

Any reason you chose the tube rather than a standard 18650 battery sled (aside from aesthetics?), the 40 will only pull 16amps max so the sled/wiring doesn't have to be super heavy duty.

Best of luck!

 

[asdaq]

Interesting tube. I would suggest drilling a small hole in the side and soldering a wire into the hole. If you tin the hole area first it really would not be to hard. Back in the day I would have used this tube quite happily for a side by side.

 

[ong.kelvin]

Have a look at the mods below. Will it work if the battery negative is not connected?

 

[drmarble]

Some chips have bat- connected to out- (outside of 510). Some (dna25?) label it out+ since they use a negative output signal. If that is the case you don't need an additional ground wire from the battery to the board. The case ground to the atomizer will be enough. My GDNA 40 has no connection to bat- and works fine at high watts.
Use a meter to check the connectivity on your board.

 

[asdaq]

Ahh, I think I read into the question the wrong way. Yes that works as there is a common ground on the board. I imagined that there was an issue with getting the negative from the battery tube itself. I use the bat- on the board, but not the out-. That said, if I disconnect the bat-, but there is an atty connected, it will still run the board enough to light the screen. Of course it wont fire that way though.

 

[ong.kelvin]

Ok, i guess only sure way is to try it myself. Still waiting on the postman.

 

[ong.kelvin]

If I connect the dna40 B- to the battery tube, will it be ok for me to also connect dna40 GND to the battery tube?

 

[drmarble]

Yes.

 

[ong.kelvin]

Cool thanks!

 

[BobC]

If I connect the dna40 B- to the battery tube, will it be ok for me to also connect dna40 GND to the battery tube?

No need, they're common

 

[ong.kelvin]

Are you saying the GND does not need to be connected to a grounding point if the B- is connected to a grounding point?

 

[BobC]

Yup, they're common on the board

 

[ong.kelvin]

To my understanding by just grounding the B- is insufficient grounding for the OUT. I have watched a few of Kudzu's vides and he recommends to also ground GND. Have you had any problems during firing without GND grounded?

 

[drmarble]

I run a dna40 with the battery- connected to out. Nothing on the battery- connector on the board. This is the GDNA bottom fed mod. It works just fine for me and many others. Connecting this way kept the wires very short as the battery is installed negative up.

 

[BobC]

To my understanding by just grounding the B- is insufficient grounding for the OUT. I have watched a few of Kudzu's vides and he recommends to also ground GND. Have you had any problems during firing without GND grounded?

If they're common, what's your point?

 

[BobC]

Guys,
the point is that GND & Bat- and USB- are all one and the same contact point on the DNA40.

Meter it to test it yourself

 

[ong.kelvin]

So why do the modders still connect both the GND and B- to individual grounding points? Sorry for silly questions, still learning.

 

[BobC]

Most people read and follow the mfg instructions, I was part of team for the mod (GDNA) drmarble referred to, originally designed for the DNA30, when we moved to the 40, we looked to keep wire lengths down, so we metered the board and found them to be common, then conferred with Brandon at Evolv who agreed, so we went with the GND contact point for both the bat- and atty gnd

 

[ong.kelvin]

So just to clarify, connect the GND to a grounding point and leave out the B-?