Help! Voltage drop?

[Mart123]

Hi. I've just made a copper mod with a bottom mechanical switch. It uses a 18650 battery, all the connections seem to be ok but when I test the voltage it go's from 4.17 down to 3.12 under load. I'm not sure on the ohms of my clearo but it works fine on my ego.
Any idea what's happening?

Thanks.

 

[Indie73]

Hi. I've just made a copper mod with a bottom mechanical switch. It uses a 18650 battery, all the connections seem to be ok but when I test the voltage it go's from 4.17 down to 3.12 under load. I'm not sure on the ohms of my clearo but it works fine on my ego.
Any idea what's happening?

Thanks.

dead acc maybe?

ТапаТолк... пойми и прости...

 

[Cjax]

post some picks. idk but it might help to see how it all connects.

 

[Mart123]

post some picks. idk but it might help to see how it all connects.

Not sure I can. I'm only on my iPhone? It's got a spring at the atty connection and a bolt at the bottom if that helps?

 

[Skyway]

Maybe a switch that can not handle the amperage or the wires might be too thin? Just putting out ideas. What kind of switch are you using?

 

[Mart123]

No wires at all. Mechanical switch that pushes directly on the negative of the battery. Can't understand it because I use a tankometer to test voltage and shows 4.17 without any load, that makes me think that the connections are ok?

 

[MattBott]

What resistance atty (or whatever) are you using?

 

[Mart123]

Not sure on the resistance but it's fine on a standard ego so am I right in thinking it should be the same or maybe even better with a 18650?

 

[breaktru]

No wires at all. Mechanical switch that pushes directly on the negative of the battery. Can't understand it because I use a tankometer to test voltage and shows 4.17 without any load, that makes me think that the connections are ok?

You're getting 4.17 w/ NO load. If there is a poor connection anywhere, at battery, at atty or at mech switch, voltage will drop. It can't handle the amperage. It's like putting a large resistor in the circuit

 

[Mart123]

That's what I was thinking but I can't see how because you need to fire the switch for the tankometer to work. Or am I missing something? Bit sad but I got alittle giddy when I saw you posted breaktru.lol.

 

[Cjax]

check the center pins on the atty and the 510 connection. maybe the tankometer is making good contact there but the clearo isnt.

Sidenote: Breaktru, I just spent all day reading about the MCU mod. Can I borrow your talent for a couple weeks or so? I guess I can settle for the DNA20 when it comes out.

 

[Mart123]

I'll have a look at that in the morning. I have tried afew different attys tho. If not I guess I'll rip it apart and try again.

 

[asdaq]

You can test segments of the mod with a multimeter checking for resistance as you go. Somewhere along the negative path you will find some higher resistance reading and can narrow down which is the offending part or connection. It sounds like the positive path doesn't have to do much so I wouldn't suspect that.

 

[breaktru]

That's what I was thinking but I can't see how because you need to fire the switch for the tankometer to work. Or am I missing something? Bit sad but I got alittle giddy when I saw you posted breaktru.lol.

The tankometer will work regardless but firing under load will show a voltage drop if there is a poor connection.

 

[breaktru]

Sidenote: Breaktru, I just spent all day reading about the MCU MOD. Can I borrow your talent for a couple weeks or so? I guess I can settle for the DNA20 when it comes out.

LOL, thanks Cjax. The DNA20 will suffice. Much easier build for sure.

 

[Mart123]

You can test segments of the mod with a multimeter checking for resistance as you go. Somewhere along the negative path you will find some higher resistance reading and can narrow down which is the offending part or connection. It sounds like the positive path doesn't have to do much so I wouldn't suspect that.

Thanks for that. I'll pick a multimeter tomorrow. It must be the switch or atty connection I'm thinking because the end caps are quite a tight fit.

 

[Mart123]

The tankometer will work regardless but firing under load will show a voltage drop if there is a poor connection.

Thanks that's good to know.

 

[Mart123]

Sorted it. It's the atty connection that seems to be the problem. The multimeter reads around 0.8 from the switch all the way to the atty connection. As soon as I test that the Reading go's nuts and jumps all over the place.