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John







Administrator

Registered: 1435395843

Posts: 500 Reply with quote #1 I'm making a new thread for discussion and testing of the new support for 2s batteries here. The firmware update to allow it should be posted shortly.



To use 2s mode, you have to make taps from the battery as usual, but because there is no third cell, the tap connection labelled 3 must be connected directly to the tap connection labelled 2. This can be done in the wire harness or by jumpering the connections directly on the board. This is the ONLY way that 2s batteries will work and balance correctly.



Other than that, it is just a matter of selecting 2 cell rather than 3 cell in the battery section.



You can use 2 cells with lipos, LiFePO4 or cylindrical lithium ion.



The max power and max preheat are 133 watts when running from 2 cells.



Attached is a battery curve for a 2s pack of LG 18650 HE2 cells. This is probably a good starting point for high drain 18650s. The measured capacity was 15.5 watt hours.

Attached Files

LG18650HE2.zip (363 Bytes, 1063 views)





VapingBad







Administrator

Registered: 1435398945

Posts: 2,449 Reply with quote #2 John I know it is a bit early to ask, but will you be making a 2S RBP module for this as well as the planned 3S one? I imaging the 3S one could do both assuming it is just a PCB.

__________________

• 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 •

DNA 75 Latest versions of EScribe: DNA 200/250

Common problems

John







Administrator

Registered: 1435395843

Posts: 500 Reply with quote #3 Yes, absolutely plan to. We see 2s replaceable battery mods being more common than 3s replaceable, just due to form factor.

VapingBad







Administrator

Registered: 1435398945

Posts: 2,449 Reply with quote #4 might have to get another board for those 20 25R & 10 VTC4s I have. might have to get another board for those 20 25R & 10 VTC4s I have.

__________________

• 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 •

DNA 75 Latest versions of EScribe: DNA 200/250

Common problems

Dejay



Member

Registered: 1437283131

Posts: 44 Reply with quote #5 Oh this is awesome! I was wondering the other day if this was possible! This removes one of my main downsides for the DNA200 for people who like externally charged batteries. Thanks evolv!

Dejay



Member

Registered: 1437283131

Posts: 44 Reply with quote #6 Will the 2s pack 8.4V option affect the minimum resistance that you can fire nickel coils?

John







Administrator

Registered: 1435395843

Posts: 500 Reply with quote #9 Well, with a 2s pack the max output voltage is 6.0V



The max output current is still 50A







turbocad6



Senior Member

Registered: 1435613389

Posts: 153 Reply with quote #10 would it be possible to select between 2s & 3s mode right from the mod? I'm guessing auto detecting 2s vs 3s can't be done? my thoughts are, now I'm using a 3 cell configuration and the mod isn't too thick for everyday use, but I could make an extended use pack that's a 2s2p and add 25% battery life as an extended battery option, and of course have an extended battery door to match. kinda like an extended battery in a cell phone type design. having to change config in the pc isn't so bad but it would be really slick if it could be selected from the mod itself for on the fly switching too and from an extended use battery.

adski







Member

Registered: 1435485657

Posts: 37 Reply with quote #11 Can we use 2 18650's in series with no balance charger connected?

Just use the USB for software only?

Thanks

John







Administrator

Registered: 1435395843

Posts: 500 Reply with quote #12 No, you have to run taps to the battery. Why destroy batteries to save two minutes of wiring?