DNA 100C Wattage drop after 3 puffs. (Geekvape z100c p Coils)

[maximumsport]

I've been using the Geekvape DNA z100c mod with the P coils rated at 0.15 70-80W. After about 4 puffs @ 75 watts and the coil gets somewhat warn not HOT the wattage would drop down to 40 watts and give a weak vape.

I've updated the chip to the latest firmware. Some how the chip is dropping the wattage. Is there any way to disable this? I've looked in escribe but could not find a setting. I use the profile Watts with punch at 1. Nothing special.

Thanks.

[dwcraig1]

Use EScribe's Device Monitor to see the voltage drop during firing. 

Here on mine the problem was due to the battery not fitting tight enough for a good connection. Poor solder joints or a battery with low amp output could also be the problem.

Note if it drops below the Soft cell cut off the power will throttle down (2.75 volts in this case)

Included is a screen shot with acceptable voltage drop.

[BillW50]

This is common with not only with DNAs, but most mods as well. If it can't get enough power from the battery, it drops the wattage until it can. Likely suspect is the battery. You will need a battery that can do 30A to get that kind of power out of it. A poor battery connection can also cause the same thing.

[maximumsport]

Thanks for the info. I have a few new Molicel's I've been using the 45B ones. Molicel P45B 21700 4500mAh 45A and it happens.

I guess over 70 watts on a single 21700 in warm atmosphere temps cause the voltage drop? 

[dwcraig1]

Use EScribe's Device Monitor to see voltage drop. Your Molicel P45B 21700 would be good for way more than 100 watts. There is a poor connection between the cell and board.....for sure.

Here is my DNA100C with Samsung 18650 20S 30 amp cell with standing voltage of 4.0 volts firing at 75 watts.

Note that the voltage dropped to 3.23 volts. It would continue to fire @ 75 watts till the voltage drop hits 2.75 volts.

[maximumsport]

Thanks for that info. But I have 2 of the exact mods and they both do the same thing. What's chances of both having bad connections?

How did you fix your connections?

[dwcraig1]

In my case the problem was on two identical new mods. SXK DNA60 Ionboxes. Two different colors purchased from two different places.

What I did was to add a blob of solder to the positive contact on the cell. I did this for both mods.

This needs to be done quickly and with a high heat soldering iron 100 + watts. I used silver solder and acid flux, same as for house hold plumbing the filed down to desired length.

To see if this could be the problem with yours perhaps you could place a small washer between your cell negative and battery door and use Device Monitor to see if you get some improvement before proceeding to my method.

The two screen shots that I posted yesterday were from one of these mods before and after my fix. 

The added length here is 1.5mm.