Official DNA 40 introduction

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retird

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tchavei

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In practical terms it means I have a limp home mode if required. ;)
True but how long will it take until someone will start to complain his mod is killing batteries one after another just to find out later he's been discharging them beyond the safe level because the board allows it?

Maybe I'm just looking at this wrong. Two years ago when my engine's injectors blew up in the middle of nowhere (manufacturer defect) I sure appreciated the fact that the car didn't stop and just kept going with two working cylinders. I did sound like a tractor and the flashing warning light to "get to a dealer NOW!" was a bit annoying but it took me there safe and sound. I guess I would be ...... if the car would shut down to protect itself.

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Tony

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tchavei

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Yeah true. They should warn you about it though. If you think the board will shut down when the battery gets too low, think again. It seems it will keep firing until there is no battery left to tell the tale.

As long as we know that, we're safe.

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Tony

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tchavei

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Ya know what bothers me is when you press both up and down buttons to enter Temperature set mode it takes whichever button you let go of last as an up or down command. i.e. enter temp mode at existing setting of 450 and when you let go of the buttons it will jump to 440 or 460. You would think the programmers would have cleared the key entry queue when entering temperature set mode. But hey what do I know.

Well you are trying to change the temp so I guess it's bearable although annoying.

What bothers me is when you want to lock your Watt setting... If you want to lock it at say 20w, you have to put it at 20.1 and press the down button first before you press and hold both to lock the setting at 20w. It will always move 0.1 up or down when you lock it.

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Tony

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Woofer

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Yeah true. They should warn you about it though. If you think the board will shut down when the battery gets too low, think again. It seems it will keep firing until there is no battery left to tell the tale.

As long as we know that, we're safe.

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Tony

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I have a recolection that someone from Evolv said they take the bat down to (I want to say) 2.5 volts. Whatever it was it was low but within the limits for the bat.
Sorry I can't be certain as I didn't really care.
 

tchavei

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I have a recolection that someone from Evolv said they take the bat down to (I want to say) 2.5 volts. Whatever it was it was low but within the limits for the bat.
Sorry I can't be certain as I didn't really care.
Yeah, 2.5 is low but 1.5V is dead. I can't see a cell survive more than a handful discharges like that if that much at all.

Not planning doing so but we all do stupid things from time to time :)

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tchavei

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I haven't had my batteries register anything lower than 3.2V when I hit the weak battery state


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Yes but you can keep firing it even with that message. The discussion was about the "hard limit" rather than the "soft limit" if one wants to talk in server space quota language :)

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Tony

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retird

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I have a recolection that someone from Evolv said they take the bat down to (I want to say) 2.5 volts. Whatever it was it was low but within the limits for the bat.
Sorry I can't be certain as I didn't really care.

hum...... this discussion is interesting and I am not seeing any factual and verified information yet about excessively low battery cut-off limits..... I mentioned the "battery drain" static test I started about 21 days ago.... ....a VTC5 battery was charged to 4.0 volts and installed in a dna40 device. The device was fired three times (in TP mode) to verify it was working..... device was set aside to check battery drain over long period of time without firing (only momentary hitting of the fire button every few days to look at the battery level)..... almost 21 days now and I checked the battery with a meter this afternoon (after this discussion started)...it was measured at 3.76 volts....so the "battery drain" test will continue....with the voltage drain to date it will be a long test if I let it get to 2.7 or 3.0 volts... yep, I was curious as to how long a battery would last in the 40 setting on the shelf and not being used....

There is one thing I do know and that is that Evolv has always placed a high importance on manufacturing a safe product. It should be used and operated within the specifications and guidelines of the product.
 

KTMRider

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I have a recolection that someone from Evolv said they take the bat down to (I want to say) 2.5 volts. Whatever it was it was low but within the limits for the bat.
Sorry I can't be certain as I didn't really care.

Most LiIon batteries have a low limit of 2.5v or 2.7v. I don't know of any regulated device (vaping or otherwise) that would take a battery down that low though.


I haven't had my batteries register anything lower than 3.2V when I hit the weak battery state


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Same here. The lowest I've seen was 3.18v when I put it in a Nitecore D2 charger. It took a little over 5 hrs at 500ma so it used all of the 2500mah rating.


Yeah, 2.5 is low but 1.5V is dead. I can't see a cell survive more than a handful discharges like that if that much at all.

Not planning doing so but we all do stupid things from time to time :)

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Tony

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A battery is unrecoverable after it goes below a certain voltage, usually 2.5v. At 1.5v, the battery will not charge again in any reputable charger. Some cheaper chargers just look for max voltage and might charge it but the battery would be pretty much toast.
 

tchavei

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Most LiIon batteries have a low limit of 2.5v or 2.7v. I don't know of any regulated device (vaping or otherwise) that would take a battery down that low though.




Same here. The lowest I've seen was 3.18v when I put it in a Nitecore D2 charger. It took a little over 5 hrs at 500ma so it used all of the 2500mah rating.




A battery is unrecoverable after it goes below a certain voltage, usually 2.5v. At 1.5v, the battery will not charge again in any reputable charger. Some cheaper chargers just look for max voltage and might charge it but the battery would be pretty much toast.
Well let's hope the lady was wrong then :)

Regards
Tony

Ps: some reputable high end chargers will attempt a recovery charge if you ask them to. It takes hours (very small trickle charge to raise the battery to minimum levels and then a soft ramp up with a C/10 or C/25 charge to maximum capacity.

Even if recovered I wouldn't use a battery like that in important applications.

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AMDTrucking

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Having mixed feelings about them :/

Using the same wire, id and number of wraps...

Pros:
- they aren't so dang big, so I can actually use it on dual cool RTAs
- I'm pretty sure it's not placebo or anything, but contact coils heat up faster, and I require lower wattage to get the same type of vape than say a spaced coil
- easier to wick

Cons:
- inconsistent :/ sometimes it glows more than it should when fired without a wick at 600F in TP. Sometimes it doesn't.
- I find that my wick can some times still get charred a little.

I'll needa try it out even more unfortunately.


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Kiwi, I made what I thought was, a perfect nickel Micro (Contact) Coil. I dry burnet it - it glowed perfectly. I used it for three days and loved it. Until I started feeling some weird aftertaste. And sure enough, two of the middle wraps have shorted to each-other and fused together. Then I quit making Micro Coils out of nickel. Just IMHO.
 

TheKiwi

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Kiwi, I made what I thought, a perfect nickel Micro (Contact) Coil. I dry burnet it - it glowed perfectly. I used it for three days and loved it. Until I started feeling some weird aftertaste. And sure enough, two of the middle wraps have shorted to each-other and fused together. Then I quit making Micro Coils out of nickel. Just IMHO.

Yeah I getcha. The whole contact coil with Ni200 is just characterized by inconsistency and unpredictability tbh. Might not be worth the effort after all I guess. My main motivation for pursuing it is cos of my dual coil RTAs but I guess I might just give up on that


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BlueridgeDog

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Then I quit making Micro Coils out of nickel. Just IMHO.

And mine...normal coils for nickel are so reliable and craftable. Micro coils in nickel are an attempt at shoe horning another paradigm onto nickel. Get an assortment of machine screws in pitches that interest you and give it a try. My nickel coils are now lasting as long as I want them too (dry burn, rinse with tap water, rewick).
 
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