dwcraig1

Your figure of 3.5 volts output (max) is right in the ballpark, you must use lower resistance to be able to achieve 30 watts/ 40 boost. https://www.the12volt.com/ohm/ohms-law-calculators.asp As far as battery sag/voltage drop be sure to use the most powerful 18350, Vapecell 9 amp or equivalent.

EScribe will help you figure it out as to what is happening. Your temp is rather low so it will be easy to hit. Check to see that your voltage drop when firing isn't dropping to the level of the Cell Soft Cut Off. Most likely you just achieving your temperature setting and the wattage is reducing as needed. In the snippet my DNA 75 dropped down to 2.71 volts for just a moment, the Cell Soft Cut Off here is 2.75 volts. If it would have stayed at 2.71 volts for any longer the wattage would have dropped.

Have you tried using the fire button that's on the board?

Method 1. Open EScribe, go to "Help tab" and select "Backups". The are dated, choose the one that you want. Connect mod and upload settings. Try with different cable if still having problems. Method 2. (see image) If no backup is listed open EScribe with mod NOT connected and choose your board, batteries, ect. Save (under File tab) to where you can find it (desktop?) You need to give it a name. With mod connected to EScribe go to "File tab" and select "Open"......choose the file that you saved and upload settings.

There are only two settings in Escribe that are going to effect the charge life of the cell. One is whether the cell charges to 4.1 volts or 4.2 volts and the other is the Cell Soft Cutoff. The curve will only make your battery gauge more accurate.

510 length just might be the problem. There is no standard for 510 so they can vary some. Is there anyway you can extend the pin on the atty?

https://www.stealthvape.co.uk/electronic-cigarette-mod-parts/evolv/DNA-BIG-SCREEN

I can only guess what it is for a 3 cell DNA250C. I would think 10 volts as the data sheet states but always it can never be more than battery voltage under load.

I just tried it with a DNA250C board with no change. As expected.

Yep, I tried it and it reset to zero, flashed it back and still zero.

Let us know how it does.

What I was concerned about is if the power wire's solder joints are connecting to the other side. If the voltage when firing is the same on both sides then they must be.

When firing via Device Monitor in EScribe do you get the same results?

Have you measured the voltage with a meter on the side with the wire?

It sounds like a poor connection between the board and coil. Using Atomizer Analyzer in EScribe can be most helpful. Self adjusting positive pins on attys can be problematic. The positive pin from the mod's 510 sometime gets stuck in the bottom of it's travel. Post screws need checked for tightness, ect. With Atomizer Analyzer you should be able to unscrew the atty more than just a quarter turn (approx) before reading becomes unstable,

There have been a few cases with that problem. I'm pretty sure the nipple position can be moved on the 510. There are some posts here about that here but I don't seem to be able to find them.

I suggest that you compare the setting between the two with EScribe.

Here is the difference on my VA spade before and after cleaning the battery cap with alcohol and Q-tip. That's a pretty big difference in voltage drop when firing. This is with a Samsung 21700 30T so a lesser power cell would have an even greater difference.

While it could be a weak battery try this first: Remove the battery adjustment cap and clean the threads on it as well as the threads in the mod for it with alcohol. I have a VA DNA75 Spade and have to do this occasionally. Also what wattage are you using and what battery?

The DNA75 max voltage is 6.2 volts. On a 250C with two cells max voltage seems to be the voltage of the cells under load. On a DNA250 with two cells max is 6.2 volts. On DNA200 with 2 cells max is 6 volts. 6.1 volts @ 1.3 ohm on a 2 cell DNA250C should be no problem.

I believe that you trouble shot it well and as you probably figure it's most likely a bad board. They are real good about taking good care of their customers.

I'd say it's time for a new battery.

Are the voltage readings during firing or at Idle. Also instead of posting battery percentage it would be better to post standing voltage as percentage is just an estimate. But it's the voltage during firing that I'm interested in. In my snip where the red arrow is pointing it says 3.47 volts when I hoover my mouse there. This is firing at 45 watts for 1 second then 35 watts on single 18650.

Using Device Monitor as pictured above note the voltage drop on each cell when firing. Your Cell Soft Cutoff by default is 3.09 volts. If one ore more cells drop below that it will throttle down. They should drop reasonably close to each other. If one is way off then most likely a bad battery. Is the pack swollen at all? If your Cell Soft Cutoff is set way higher consider setting it to 3.09 volt area.

Using Device Monitor in EScribe check the voltage on each cell and post here.