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IMR or only li-poly


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It appears that IMR 18650s can be used but you would need an accessory board from Evolv to convert them to a pack with the appropriate tap connector.

Page 10 of the datasheet says the following:

"If you are manufacturing a device that is designed to be used with three individual replaceable 18650 cells, an accessory board is available from Evolv to adapt from three individual cells to a pack and tap connector pinout, as well as provide cell-by-cell protection against incorrectly installed or reversed cells."

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Also on p13
The DNA 200 runs from a 3s lithium polymer type battery pack. This type of battery requires cell-by-cell battery monitoring and balance charging to operate safely. The DNA 200 connects to the cell taps on the battery pack with a four position JST-XH connector. The tap connector must be connected for the DNA 200 to run.

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I have not seen this accessory board for sale anywhere which leads me to believe its not going to be out with the release of this chip. It's something coming a little later. So most people are going to have to use the lipo's till that board is released. Which for me it doesn't matter because I am planning a build for power supply and one for on the go with a lipo.

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Balancing tap is nothing more than wired taps on your batteries. If you are going to run 3s IMR's, wire in a balancing tap and the DNA200 will charge and monitor each cell. the eBay link is for reference only

http://www.ebay.com/itm/5-PCS-3S1P-Balance-Charger-Cable-Wire-JST-XH-Connector-Adapter-Plug-/221751627797?pt=LH_DefaultDomain_0&hash=item33a16d5015

-C

BalWire.jpg

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I kept it simple and used springs that will collapse on a short. It wouldnt protect the chip, but it doesn't protect against reversed batteries shorting against each other.

James said:

The reason for an accessory board is to provide reverse voltage protection for each cell. Otherwise you could damage your board and/or batteries in the event you put one in backwards.

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On DNA30s I have used a spring with a diameter too big for the +ve battery terminal for -ve connection and a completely flat +ve connection that will not make contact with the -ve end of batteries with a flat bottom and heat shrink extending over the bottom like 25R & VTC4.  It is the flat positive connection that really provides the protection, I have fitted batteries the wrong way 3 or 4 times in another DNA30 I did like this and it is still going after 18 months.
[04_BSpring]

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  • 2 months later...

Hey guys! I was reading through everything and I had a question about the connection to the board needed. According to the pictures posted of the physical board, there is a 1-3 and a ground. According to the diagram posted earlier, there are 4 connections( 2 pos, 2 neg) but no ground. So my question is, does there need to be a ground and if I plan on doing 26650s can I just solder to each POS part of the cradle? 

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Xavier, don't go on the colors used in Cisco's diagram. On the balance connector he means bottom black to GND, then red to 1, black to 2 and top red to 3. Guess he assumed everyone would read it like that. If you use a connector there you can switch between a lipo and imr pack Optionally you can bridge - to GND and + to 3 on the board and only connect wires 1 and 2 to the bridges on the sled. Be advised that any 3*1s setup should wait for the specific extension board to provide single cell reverse battery protection.

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  • 1 month later...

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