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xu7jp4

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Reply with quote  #16 
DNA 75 works great max @30/35w after weak battery [frown]

This is definitely the first and last[smile]

Adios dna75 and welcome dna 200...

Don't buy the dna 60,75,133,167 save your money and buy 200 or 250 with 3 battery not lipo...

That's all

ChunkyButt200

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Reply with quote  #17 
Quote:
Originally Posted by xu7jp4
DNA 75 works great max @30/35w after weak battery [frown]

This is definitely the first and last[smile]

Adios dna75 and welcome dna 200...

Don't buy the dna 60,75,133,167 save your money and buy 200 or 250 with 3 battery not lipo...

That's all

this is all dependent on the type of battery you use. 26650, 18650, mah, cdr. If you cannot provide the necessary current the board requires you will get the weak battery message. I use LG HD2C batteries. They work fantastic for the DNA 75, at high wattages. No premature errors.

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1.21 JIGAWATTS............GREAT SCOTT!........WHAT THE HELL IS A JIGAWATT?
• I am not employed by nor do I represent Evolv Inc.  All opinions are my own, they are just opinion not fact and can be wrong •
Latest versions of EScribe: DNA 200 • DNA 75  Common problems
EVOLV HELP DESK - https://helpdesk.evolvapor.com/?a=add
LOST VAPE WARRANTY REPAIR - http://www.lostvaperepaircenter.com
xu7jp4

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Reply with quote  #18 
18650 25r or 26650 mxjo it's the same @50% impossible to have 60w with a coil 0,3
I have message weak battery or check battery...
I think it's normal with 1 battery, it's impossible to have 60w @50%...just 40w
Now i'm on triade with coil 0.07 @120w and 10% vape on ;-)
Definitely DNA 75 is not for high wattage or just 10 seconds ahahahah...
Vt75 go to the trash
ChunkyButt200

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Reply with quote  #19 
i will agree that the DNA 75 is power hungry. just know, the way Hcigar implemented the connection from the battery to the board in the VT75 is less than ideal, IMO. as i said, my SMY DNA 75 performs just fine with no "weak battery" messages until the 20%-15% mark, this is when vaping at 65w with a 2 second 75w preheat, punch set to 11. 

instead of trashing your VT75, PM me. 

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1.21 JIGAWATTS............GREAT SCOTT!........WHAT THE HELL IS A JIGAWATT?
• I am not employed by nor do I represent Evolv Inc.  All opinions are my own, they are just opinion not fact and can be wrong •
Latest versions of EScribe: DNA 200 • DNA 75  Common problems
EVOLV HELP DESK - https://helpdesk.evolvapor.com/?a=add
LOST VAPE WARRANTY REPAIR - http://www.lostvaperepaircenter.com
dwcraig1

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Reply with quote  #20 
I tested out my SDMY75 a couple of weeks ago with an Aromamizer  running a couple Kanthal Claptons @75 watts. I use an LG HD2 18650. There was nothing scientific about my test and I noticed nothing unusual battery wise. It appeared to operate as one would expect a single 18650 mod at 75 watts. I thought it lasted much longer than I expected. Just saying.
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diagonal

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Reply with quote  #21 
At 0.3 ohms and 45 watts both with the mxjo3500mha as well as with the IJoy batteries always the proplem which at 50% at the latest the battery symbol flashes and the power down regulates
VapingBad

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Reply with quote  #22 
If that is an 18650 Mxjo it is not surprising, the board is rated at 28 A max, 32 A pulse current and that battery is only 10 A https://www.e-cigarette-forum.com/forum/threads/mxjo-20a-3500mah-18650-bench-test-results-just-another-rewrapped-10a-battery.737524/ 

If it is the 26650 https://www.e-cigarette-forum.com/forum/threads/26650-battery-bench-test-results-and-new-ratings-table.725452/#post-17227385 then the IR with 26650s tends to cause high sag, but I would expect better than your result.

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• I am not employed by nor do I represent Evolv Inc.  All opinions are my own, they are just opinion not fact and can be wrong •

Latest versions of EScribe: DNA 200/250DNA 75
Common problems
AMDtrucking

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Reply with quote  #23 
This just in! I finally, got hold of A123 systems LiFePo4 26650 battery, that is NOT fake. [nono]
I did some tests and, most importantly, vaped most of the day at 75 Watts. IMHO, that battery is our only salvation. It needed some adjustments though. I switched to "Lithium-Polymer" and set the lowest voltage to 2.5V, ran Battery Analyzer and saved the graph:
 
As you can see, from the graph, the battery was charged to full 4.2V. But as soon at the first load was introduced, the battery's voltage dropped to it's normal 3.32V and continued to work flawlessly for pretty long time at 75 Watts. The usable capacity ended up being 7.967 W/h (2400mAh). None of my existing Li-Ion 26650 batteries was able to do that.  VapPower 4200mAh = 158.9mAh (0.588 W/h),  Sony US18650VTC5 = 619.5mAh (2.292 W/h),  Sony US26650VT = 430mAh (1.591 W/h). "Weak Battery" message, is the thing of the past![smile] Too bad, I only bought one of these batteries because I have two DNA75 devices. But I wasn't sure that LiFePo4 was going to do it for me. [confused] Especially, after my first A123 turned out to be FAKE, I bought it on eBay. I've already placed an order for few more HERE. If anyone is interested, I'm placing the content of my CSV battery profile. Just copy it into Notepad and save as .CSV file. Or use my, attached file, if you want.

"Battery Charge (%)","Cell Voltage (V)"
0,3
1.12965977191925,3.04999995231628
2.78649425506592,3.08999991416931
3.86594724655151,3.09999990463257
7.05409812927246,3.16000008583069
13.5810213088989,3.20000004768372
31.5175094604492,3.25
95.1173629760742,3.3199999332428
96.7490921020508,3.33999991416931
98.3808212280273,3.53999996185303
100,4.19000005722046

I forgot to add: According to my measurements, the Internal Resistance of my A123 was 13 mΩ and I was able, easily, get 50A current from this battery. For that, I made special Voltmeter, that is capable of conducting such current. It is solid SS construction and the wire inside is 12 Gauge. Internals of the spring loaded 510 connector are from Fat Daddy connector.

I also made me a hefty battery holder. For test and charge purposes with spring loaded terminal. 
  

I later, adjusted my discharge graph (manually). I only changed beginning voltage from 4.2V to 3.6V. Also, I changed my low voltage limit from 2.5V to 2.7V, otherwise "Weak Battery" message never shows, even when the mod can't vape anymore. [smile]  But I was able to vape Billow V3 with two coils, made out of 26 Gauge NiFe48, with TC, at the actual power of 71W - 75W pretty much all day today. One Billow V3 and a half. All that, on a single battery charge. And I will only charge LiFePo4 battery in my SkyRC MC3000 to 3.6V because, USB will attempt to charge it to 4.2V and that's not good. 

"Battery Charge (%)","Cell Voltage (V)"
0,3
1.12895047664642,3.05000305175781
2.78634595870972,3.08999633789063
3.86725568771362,3.10000610351563
7.0559401512146,3.16000366210938
13.5804328918457,3.19999694824219
31.5175342559814,3.25
95.1170806884766,3.32000732421875
96.747444152832,3.33999633789063
98.3808288574219,3.42441868782043
99.9991836547852,3.59883713722229


 

 
Attached Files
zip A123_LiFePo4.zip (400 Bytes, 21 views)

awsum140

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Reply with quote  #24 
That's really going the "extra mile", AMD!
ChunkyButt200

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Reply with quote  #25 
Quote:
Originally Posted by AMDtrucking
This just in! I finally, got hold of A123 systems LiFePo4 26650 battery, that is NOT fake. [nono]
I did some tests and, most importantly, vaped most of the day at 75 Watts. IMHO, that battery is our only salvation. It needed some adjustments though. I switched to "Lithium-Polymer" and set the lowest voltage to 2.5V, ran Battery Analyzer and saved the graph:
 
As you can see, from the graph, the battery was charged to full 4.2V. But as soon at the first load was introduced, the battery's voltage dropped to it's normal 3.32V and continued to work flawlessly for pretty long time at 75 Watts. The usable capacity ended up being 7.967 W/h (2400mAh). None of my existing Li-Ion 26650 batteries was able to do that.  VapPower 4200mAh = 158.9mAh (0.588 W/h),  Sony US18650VTC5 = 619.5mAh (2.292 W/h),  Sony US26650VT = 430mAh (1.591 W/h). "Weak Battery" message, is the thing of the past![smile] Too bad, I only bought one of these batteries because I have two DNA75 devices. But I wasn't sure that LiFePo4 was going to do it for me. [confused] Especially, after my first A123 turned out to be FAKE, I bought it on eBay. I've already placed an order for few more HERE. If anyone is interested, I'm placing the content of my CSV battery profile. Just copy it into Notepad and save as .CSV file. Or use my, attached file, if you want.

"Battery Charge (%)","Cell Voltage (V)"
0,3
1.12965977191925,3.04999995231628
2.78649425506592,3.08999991416931
3.86594724655151,3.09999990463257
7.05409812927246,3.16000008583069
13.5810213088989,3.20000004768372
31.5175094604492,3.25
95.1173629760742,3.3199999332428
96.7490921020508,3.33999991416931
98.3808212280273,3.53999996185303
100,4.19000005722046

I forgot to add: According to my measurements, the Internal Resistance of my A123 was 13 mΩ and I was able, easily, get 50A current from this battery. For that, I made special Voltmeter, that is capable of conducting such current. It is solid SS construction and the wire inside is 12 Gauge. Internals of the spring loaded 510 connector are from Fat Daddy connector.

I also made me a hefty battery holder. For test and charge purposes with spring loaded terminal. 
  

 

AMD.... at 2.5v set for your cell soft cutoff, have you noticed any strange behavior when the battery is low and you're actually hitting that 2.5v limit cutoff? when i tried a CSC of 2.5v the dna 75 didn't like it, spitting out shorted and other errors when the sag reached that voltage. the hard cutoff is 2.5v so there is no wiggle room left for the board. the dna 75 will not operate below 2.5v and setting my CSC that low caused the board to intermittently reset when trying to vape with a low battery. curious as to your findings when your new lifepo gets seriously low in voltage.

__________________
1.21 JIGAWATTS............GREAT SCOTT!........WHAT THE HELL IS A JIGAWATT?
• I am not employed by nor do I represent Evolv Inc.  All opinions are my own, they are just opinion not fact and can be wrong •
Latest versions of EScribe: DNA 200 • DNA 75  Common problems
EVOLV HELP DESK - https://helpdesk.evolvapor.com/?a=add
LOST VAPE WARRANTY REPAIR - http://www.lostvaperepaircenter.com
AMDtrucking

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Reply with quote  #26 
Quote:
AMD.... at 2.5v set for your cell soft cutoff, have you noticed any strange behavior when the battery is low and you're actually hitting that 2.5v limit cutoff? when i tried a CSC of 2.5v the dna 75 didn't like it, spitting out shorted and other errors when the sag reached that voltage. the hard cutoff is 2.5v so there is no wiggle room left for the board. the dna 75 will not operate below 2.5v and setting my CSC that low caused the board to intermittently reset when trying to vape with a low battery. curious as to your findings when your new lifepo gets seriously low in voltage. 
__________________
1.21 JIGAWATTS............GREAT SCOTT!........WHAT THE HELL IS A JIGAWATT?


Actually you are right, and I did experience the Hard Cutoff before I saw any Soft Cutoff. That's why I changed 2.5V to 2.7V later today. But I did not see any abnormal activity of the board all day today even when there was no room to wiggle. [smile] The only thing that I do not know how to do, is how to limit USB charging to 3.6V? For now, I'm only charging LiFePo4 in my external charger.
And by the way, real capacity of A123 LiFePo4, that I get, using SkyRC MC3000 and SkyRC D100, is around 2700 mAh.
Markyt123

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Reply with quote  #27 
Hi AMD trucking, followed your advice and went for lifepo4 but my battery indicator is blank? Have I missed a setting?
Markyt123

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Reply with quote  #28 
I'm new to DNA so any help would be appreciated
Markyt123

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Reply with quote  #29 
Loaded the csv file. Now showing battery life but dips on firing to 50% then goes up again? 2 puffs and showing weak battery again. Saw your post re evolv lipo response. Basically, this thing is currently useless unless I can make it work. No tc because of reduced power under weak battery. Looking like a swizz. Should have spent £ 160 on a decent yihi rather than £ 100 on dna75 and 50quid on a new lofepo4 battery and battery charger. Might be an easy fix but if no solution then I reckon yihi vs DNA is an easy equation to solve! No graphs needed
AMDtrucking

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Reply with quote  #30 
Markyt123, I still am using my LiFePo4 batteries. Granted, DNA75 cannot use all of it's capacity because it's Hard Cutoff voltage is 2.5V. But above 2.5V (approximately 70% of battery capacity) it is using like no other battery could. Lower your Soft Cutoff voltage in Escribe and you won't be seeing Weak Battery very often.
As I mentioned before, my first experience with A123, that I purchased on eBay, was not very pleasant. You guessed it.. Because it was FAKE.
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