scoopy Posted August 3, 2015 Author Report Share Posted August 3, 2015 was wondering if it was ok to charge my battery with it hooked up to the balance port on the chip or does it need to be grounded and have the b+ and b- hooked up to.....cuz I ytried and I'm getting reading but cell 1 on 2 different batterys in about a volt or more lower Link to comment Share on other sites More sharing options...
VapingBad Posted August 3, 2015 Report Share Posted August 3, 2015 You need it all connected. Link to comment Share on other sites More sharing options...
scoopy Posted August 3, 2015 Author Report Share Posted August 3, 2015 I figured that was probably why but didn't understand why it all read the same but cell 1 Link to comment Share on other sites More sharing options...
VapingBad Posted August 3, 2015 Report Share Posted August 3, 2015 The balance taps will not carry enough current, but they may charge at a low rate John said they never carry more than 40 mA per pin. Link to comment Share on other sites More sharing options...
KTMRider Posted August 3, 2015 Report Share Posted August 3, 2015 Check the 4 resistors to the right of the USB port. The far right resistor on my board was knocked off a bit and caused cell 1 to read very low (~1v). Link to comment Share on other sites More sharing options...
Legros Posted August 3, 2015 Report Share Posted August 3, 2015 Connecter b+ /b- for the board to read correctly your batt Link to comment Share on other sites More sharing options...
scoopy Posted August 4, 2015 Author Report Share Posted August 4, 2015 The resistors look fine...... is that true that u have to have the b+ and b- connected for it to charge right ....maybe John can comment on this Link to comment Share on other sites More sharing options...
Legros Posted August 4, 2015 Report Share Posted August 4, 2015 John confirmed to me you need battery connection to charge and to display cell voltage correctlyhttps://forum.evolvapor.com/topic/68428-topic/?do=findComment&comment=915419 Link to comment Share on other sites More sharing options...
scoopy Posted August 4, 2015 Author Report Share Posted August 4, 2015 OK thank u....l was hoping that was the case Link to comment Share on other sites More sharing options...
techbearus Posted August 4, 2015 Report Share Posted August 4, 2015 Huh.. that's interesting.. As the voltages are not consistent, do you think the board should limit users from charging if the power cables are not connected. I saw an instagram video earlier that shows the battery charging while the power leads doesn't seem to be connected.Link: https://instagram.com/p/4776UAj0KT/ Link to comment Share on other sites More sharing options...
scoopy Posted August 4, 2015 Author Report Share Posted August 4, 2015 Man this has me worried now......I just don't understand why all the voltages are right except cell 1....guess I'll find out if my board is bad when I get my case and everything connected Link to comment Share on other sites More sharing options...
VapingBad Posted August 4, 2015 Report Share Posted August 4, 2015 Could be a bad cell, damaged balance wire, dry solder joint or resistor damaged. Can you test the battery even a mulit metre will tell you what voltage is present on the balance plug. Link to comment Share on other sites More sharing options...
scoopy Posted August 4, 2015 Author Report Share Posted August 4, 2015 2 different batteries do it.....everyone keeps saying once I connect the battery all the way and ground it that it will be fine but I'm unsure and worried Link to comment Share on other sites More sharing options...
KTMRider Posted August 5, 2015 Report Share Posted August 5, 2015 scoopy said:2 different batteries do it.....everyone keeps saying once I connect the battery all the way and ground it that it will be fine but I'm unsure and worriedWho is "everybody"? I bought one of these battery checkers to test multi-cell lipos:http://www.ebay.com/itm/121680867706?_trksid=p2060353.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT Link to comment Share on other sites More sharing options...
scoopy Posted August 5, 2015 Author Report Share Posted August 5, 2015 I looked at all my resistors and solder joints and checked the batterys on a meter and all is good.....I just don't understand why it reads cells 2 and 3 normal but cell one is like a volt lower Link to comment Share on other sites More sharing options...
Brandon Posted August 5, 2015 Report Share Posted August 5, 2015 Scoopy, have you check the battery voltage with a multimeter. I think that is a good starting place. Link to comment Share on other sites More sharing options...
protovapor Posted August 5, 2015 Report Share Posted August 5, 2015 You can meter the cells directly to check them, but it is true that the board will not read all cells properly without the B+ and B- connected. It will do exactly what you are seeing.The charge symbol comes on even in that condition. Link to comment Share on other sites More sharing options...
scoopy Posted August 5, 2015 Author Report Share Posted August 5, 2015 ya I get 3.84 on pin 1 7.69 on pin 2 and 11.54 on pin 3....pin 4 is ground right......this reads like this on 2 different packs....I though all 3 should read the same....it seems pin 1 is reading 1 single cell and pin 2 is reading 2 cells combined and pinn 3 is the total voltage.......these readings were taken directly from the balance plug of 2 different batteries Link to comment Share on other sites More sharing options...
protovapor Posted August 5, 2015 Report Share Posted August 5, 2015 That is correct if you go from ground to each pin. If you want each cell measure adjacent pin pairs. Link to comment Share on other sites More sharing options...
Brandon Posted August 5, 2015 Report Share Posted August 5, 2015 I should have read all the way through the thread, with only the tap connected you won't get an accurate reading. Link to comment Share on other sites More sharing options...
John Posted August 5, 2015 Report Share Posted August 5, 2015 With only the tap connected, the board is grounding through the lowest balance resistor. So the lowest cell will read wrong. Without the main power leads connected, it is dumping the energy from the charger into the overvoltage protection diode, not the battery. The battery never even sees the charge current. So you're heating the board up for no gain. Don't do that. Link to comment Share on other sites More sharing options...
scoopy Posted August 5, 2015 Author Report Share Posted August 5, 2015 thank you john....wont happen again lol Link to comment Share on other sites More sharing options...
blueridgedog Posted August 7, 2015 Report Share Posted August 7, 2015 How is the balance performed? In prior RC implementations the balance port would drain cells that reached peak early and the charge was solely through the main connection. There was some discussion on other forums that implied the Evolv balancer was adding a micro charge to achieve balance. Is it charging or discharging to balance? Link to comment Share on other sites More sharing options...
John Posted August 7, 2015 Report Share Posted August 7, 2015 It is discharging to balance. Link to comment Share on other sites More sharing options...
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