Strange DNA30 battery level behavior... anyone seen this?

[eda123]

Hi all,

In the last few days ive noticed an odd thing with one of my DNA30 devices.

On Friday:

• I put a full battery in, and when it reads about half-full on the display after a few hrs of vaping, it started showing the battery level fully depleted.
• Then when I fire it, it shoots back up to around 50%.
• Then when not firing, it watched the display and it went back down, to say 10%.
• Then i fire it, and it shoots back up to 50%.

Yesterday I didnt see this at all.

This morning:

• A battery was showing nearly fully depleted on the display (pretty much 0%).
• I put it in the charger, and the charger read 3.6V?
• I put it back in the mod, and now it wasnt showing a depleted battery. Maybe 20%.
• I vaped it until it wouldnt fire anymore, put it on the charger, and it read 3.55V.

What the heck?

I guess it could be one of my batteries has an issue (ill have to start tracking which battery/batteries show this), but has anyone else seen this?

 

[Keynith]

I've been having that issue too! I put a fresh battery on and it goes to half and then to none within an hour. I fixed it by taking the battery out and putting it back in. Out of curiosity what device do you have? My hana has problems making contact with the battery which could cause a false reading.

Sent from my SCH-I535 using Tapatalk

 

[eda123]

Mines a zna. Hmmmm... I mailed evolv to see if they have any comments. Will post any info I get from them.

 

[Keynith]

Maybe it's a fluke with the 30's. Are you using flat tops or button tops? I got the button top converters and have had no problems since

Sent from my SCH-I535 using Tapatalk

 

[eda123]

Button top aw imr. Seems like it is not specific to one 18650... Over the course of today I observed it on two of them. But the odd thing is that 18490s don't seem to have an issue. Hmmm

 

[Keynith]

Idk i haven't had the problem since fixing the connections

Sent from my SCH-I535 using Tapatalk

 

[GemCutter]

I have seen the battery level fluctuate quite a bit when changing power levels but not when staying at the same level.

 

[frazz]

I am having this issue as well on two ZNA's. Also, my ZNAs will start resetting. Two devices, many different batteries.... all AW imr's.

Beginning to regret getting these.

 

[eda123]

My 490's seem ok.. just EVERY 650 i put in starts showing its completely depleted, yet the charger shows 3.6-3.7V! Mike said it may be a defective board, he's having me try a few experiments just to be sure.

 

[frazz]

My 490's seem ok.. just EVERY 650 i put in starts showing its completely depleted, yet the charger shows 3.6-3.7V! Mike said it may be a defective board, he's having me try a few experiments just to be sure.

Can you elaborate on the experiments? I would like to try them as well.

 

[erawtik]

My zna does it with my 490s

 

[eda123]

First he said get a brand new, authentic AW. He said a lot of places are selling fakes, especially b&M, and don't even know it.

I did that, and still have the issue.


Then Friday he suggested I try running through a battery at ~11W instead of my usual 18. I did that yesterday and still see the issue.



But it's weird, only 650s do it.... I just ran down a 490 to 3.4V. The 650s will stop firing at 3.6-3.7V no matter what I do. I think it's a bad board.

 

[frazz]

First he said get a brand new, authentic AW. He said a lot of places are selling fakes, especially b&M, and don't even know it.

I did that, and still have the issue.


Then Friday he suggested I try running through a battery at ~11W instead of my usual 18. I did that yesterday and still see the issue.



But it's weird, only 650s do it.... I just ran down a 490 to 3.4V. The 650s will stop firing at 3.6-3.7V no matter what I do. I think it's a bad board.

If it is bad boards then I was unlucky enough to find two of them... and I am not sure why they would say run at around 11 watts on a board that is supposed to run at 30.....weird. Does yours do the resetting when the fluctuations occur?

 

[eda123]

It occasionally does the reset... but eventually it continuously does the reset even when the battery has plenty of charge left.

 

[ambientech]

First he said get a brand new, authentic AW. He said a lot of places are selling fakes, especially b&M, and don't even know it.

I did that, and still have the issue.


Then Friday he suggested I try running through a battery at ~11W instead of my usual 18. I did that yesterday and still see the issue.



But it's weird, only 650s do it.... I just ran down a 490 to 3.4V. The 650s will stop firing at 3.6-3.7V no matter what I do. I think it's a bad board.

The board has no idea if it is a 18490 or 18650. The DNA chip does look at both voltage and internal resistance but for the cutoff only voltage. If it will discharge your 18490 down to 3.4V but 3.7V on 18650 the problem is with the battery's ability to deliver the current you are asking for. I don't have a ZNA but IIRC you have to add a sleeve to use a 18650 correct? That alone will add resistance in the circuit and cause a drop in current flow. Clean the threads and apply noalox to them and your issue will probably be solved. If not it is a mod design issue not board issue.

 

[Nomoreash]

The board has no idea if it is a 18490 or 18650. The DNA chip does look at both voltage and internal resistance but for the cutoff only voltage. If it will discharge your 18490 down to 3.4V but 3.7V on 18650 the problem is with the battery's ability to deliver the current you are asking for. I don't have a ZNA but IIRC you have to add a sleeve to use a 18650 correct? That alone will add resistance in the circuit and cause a drop in current flow. Clean the threads and apply noalox to them and your issue will probably be solved. If not it is a mod design issue not board issue.

The ZNA uses 18490 or 18650 length Z2 threaded tubes. As long as the tube threads are clean other contact points are the same, battery fits snug in both tubes so that shouldn't be an issue.

 

[Loop]

I am using a ZNA 30 and am experiencing the resetting problem with AW 18490's and AW 18650's. I have also noticed that when the battery is low it just resets itself upon firing is that normal? I am used to the kick modules doing the pulse thing when the battery gets low and thought that feature would be incorporated in to the DNA 30 board, but I could be wrong.

 

[eda123]

resetting when firing is normal when the battery is depleted to 3.3-3.4V. Check the DNA30 manual here:

http://www.evolvapor.com/datasheet/dna30.pdf

Device resets: If the battery is not able to power the device at the desired setting, or the battery is
excessively discharged, the device may go immediately into a low voltage shutdown. If firing the device
causes the screen to blank out and then display the welcome screen, you should charge, replace or
upgrade your battery. This is especially common at power settings above 20 watts.

 

[ambientech]

The ZNA uses 18490 or 18650 length Z2 threaded tubes. As long as the tube threads are clean other contact points are the same, battery fits snug in both tubes so that shouldn't be an issue.

Then I see no problems.

Like I said before, the dna board doesn't know what battery you are using. It just knows the battery internal resistance, including resistance of mod, and the voltage. If the voltage drops below the cutoff it will shut it down. Also resting voltage after cutoff means nothing. Take a battery with high IR, the resistance to current flow will cause the voltage to sag more under load where as one with a low IR will not sag as much. The only way to know if there is a problem is to fully charge the battery and then discharge until cutoff. Then put it on a hobby charger that display's the amount of mah put back in. My bet is nothing is wrong and you guy's are worried about nothing.

 

[ambientech]

My Hana V3 is almost dead, when it cuts off I am going to remove my AW 18650 and measure the voltage. I have a very accurate charger with display (Cell Pro Power Lab 8.) I will post back in a couple hours with the details.