Battery Question Dna Device

[showell]

I'm building another dna20 device so I was wondering if this battery would be fine in the 1590A Enclosure...
Turnigy nano-tech 2000mAh 2S1P 20~40C Lipo Receiver Pack

It looks fine to me but having no RC experience I didn't know if that receiver pack part made a difference... Thanks in advance once the build begins I will be starting it's own thread for pointers along the way...

 

[showell]

And yes I plan to break it down and wire them in parallel for a 4000mah Milo.... if anyone has other batter suggestions please don't hesitate...

 

[showell]

Bump Hopefully somebody can help me.

 

[showell]

Another bump, I know there is a lot of big brains around here someone throw something out there please.

 

[Zanderist]

I'm gonna add to your series of bumps.

Get yourself QCAD and draw the thing out.
QCAD - What is QCAD?

 

[showell]

hrmmm Im getting QCAD now but I'm not to worried about it fitting in the box my concern is when I break the pack down and wire them in parallel I will have 4000mah and I hear mix things on the C rating some say that it doubles as well others say it doesn't. So with these two batts in Parallel will I have enough to effectively run the DNA20 with no issues I like higher wattage so I plan on staying between 17 and 20 watts....

 

[Zanderist]

It will double the current capacity, but the voltage stays the same. That is in a parallel configuration, just as long as the batteries are of the same chemistry type.

Its pretty much the laws that dictate current in series or parallel circuits.

In Series you current is going to remain the same through out.
In parallel it is going to be the sum of all the currents.

However in the case of batteries your not going to increase the output current, that is dictated by your load and how much voltage your trying to pull through it. What you will increase is how long the thing will last.

The main issue you may get is if one cell is at a higher voltage than the other and that it will try to push current through the weaker battery until it has reached a state of equilibrium

 

[showell]

Thank you for the detailed response so with the batteries discharging at 20c will that be enough to handle the dna20 at higher wattage. I have read on here people using them but I don't know if there is any issues. The How-To put together by MAMU uses 25c batteries in parallel but they are only 1200 mah if I can use the ones above I will get a much longer vape time the only problem is I haven't built in a box of this size so I don't know if they will fit along with everything else....

 

[Zanderist]

Try building the circuit on a bread board.

If you can't afford one of the fancy one's do exactly as shown in this video for prototyping (shows exactly why its called a breadboard).

Collin's Lab: The REAL Breadboard - YouTube

Just test your idea out so when you finally build it, its not going to explode on the launchpad.

You may actually have to refer to the technical datasheet of this chip set to make sure your not taking it out of its design comfort zone.

 

[opuscroakus]

A 2000mAh with a 20C rating will deliver a max constant of 40Amps. Plenty of power for a DNA20 device.

 

[showell]

Opuscroakus thanks I will measure again to ensure they will fit I love this forum

 

[Doug_xx2]

A 2000mAh with a 20C rating will deliver a max constant of 40Amps. Plenty of power for a DNA20 device.

How many c should I be looking at to run the DNA 30 at max output?

 

[opuscroakus]

How many c should I be looking at to run the DNA 30 at max output?

Somebody will correct me if I'm wrong, but I believe the max pull from the battery by the DNA is 12 Amps. A 20C rated battery would be just fine.

 

[Doug_xx2]

Somebody will correct me if I'm wrong, but I believe the max pull from the battery by the DNA is 12 Amps. A 20C rated battery would be just fine.

The stats are:

Output Power 7 Watts 30 Watts
Output Voltage 4 Volts 8.3 Volts
Output Current 10 Amps
Atomizer Resistance .5 Ohms 1.5 Ohms 3.0 Ohms
Input Voltage 3.2 Volts 3.7 Volts 4.3 Volts
Input Current 1.5 Amps 6.0 Amps 12 Amps
Screen On Current 25mA
Quiescent Current 1 mA
Power Down Current 30 uA
Efficiency 94%
Weight 6g
Footprint .65” x 1.30”
Thickness .35”
Screen size .69” OLED

so at 12 amps how long could I expect a 20c battery to last with chain vaping? I mean if it were constant on (not that it is capable of doing that how long would a 2000mAh 3.7v battery with a 20c rating last anyway.

They say this about the required battery and their charging unit:
A single cell rechargeable lithium chemistry battery is recommended. Either a lithium ion or a
lithium polymer type can be used. Any battery used should be rated for a MINIMUM of 12 amps
continuous discharge current. High C rated lithium polymer or IMR cylindrical cells are strongly
preferred. Make sure that all contacts and connections are capable of handling at least 12 amps.
Charger:
Evolv offers an accessory DNA Charger which is USB powered and provides a 500 milliamp
charge current. The use on an onboard charger is optional – a removable battery will also work.

How many c does 500 mah make? Does anyone know what the math formula is? grrrrr math a frassin rasafrassin math a whack. lol

 

[Doug_xx2]

does this count as a box mod???








Maybe a chrome plated tactile switch???

 

[bapgood]

DNA30 at 30 watts needs a battery capable of constant 12amp discharge. The c-rating of a lipo is only half the equation....c-rating x battery amp hours = constant amp discharge rating.....2000mAh = 2Ah x 20c = 40amp constant discharge rating.

C-rating has nothing to do with the charger as far as the charger is concerned. The charger will charge at a 0.5 amp rate, most lipo's are rated for at least a 1C charge rate. So for a 2000mAh battery that is a 2 amp charge rate.


Study up at - Basic to Advanced Battery Information from Battery University

 

[Doug_xx2]

DNA30 at 30 watts needs a battery capable of constant 12amp discharge. The c-rating of a lipo is only half the equation....c-rating x battery amp hours = constant amp discharge rating.....2000mAh = 2Ah x 20c = 40amp constant discharge rating.

C-rating has nothing to do with the charger as far as the charger is concerned. The charger will charge at a 0.5 amp rate, most lipo's are rated for at least a 1C charge rate. So for a 2000mAh battery that is a 2 amp charge rate.


Study up at - Basic to Advanced Battery Information from Battery University

Thanks for the math and the link exactly what I was looking for. I ended up getting 2 Sony US18650VTC4 2100mAh Li-Ion Rechargeable High Drain Battery 30A. I think they might cut it. I was wanting to go with a flat lithium cell from hobby king that they use to build rc cells but it was on back order and I didn't want to tear cells apart to get it. Turnigy 2200mAh 1S 40C Lipoly (Single Cell) (USA Warehouse) .

Ah well I can always tear down and rebuild later. You know how impatience is....

Thanks for all the help

 

[Doug_xx2]

BTW is this a good design for a BOX mod. roflmao!!!!

http://www.e-cigarette-forum.com/forum/members/doug_xx2-albums-box-mod.html

 

[bapgood]

I have tested single and dual Sony VTC4 and LG HE2, both work single (with a good low resistance connection to the DNA) as well as dual.

 

[Doug_xx2]

I am using 22 gauge twisted copper wire right now comes in at almost no ohms. I might end up going with a smaller gauge if I have to or a solid core wire but as of right now 22 twisted coper with 62/36/2 rosin core silver bearing solder is the plan. Still trying to decide on what to use for the atty connector and how to connect the battery though I would like to be able to remove the batteries without a soldering iron if I have to so maybe a spring and tab connector I'm not sure but it shouldn't add too many ohms to the circuit