Anx2k
New Member
Hi all - I've purchased the JBD AP21S001 BMS and am trying to us it in an 8s configuration. I following their funky wiring diagram, so I've joined leads 6-19 together on cell 6, and when I plug in the BMS it shows 8 cells as expected, but the voltage on cell 1 is lower than it should be - it reports ~2.7v and the rest of the cells all show ~3.3v. I went through with my multimeter and double checked all the connections, so confirmed all the batteries are 3.3v, confirmed that the probe ends are all 3.3v between eachother, and also confirmed that the voltage on the JST connector reads as expected. I have bough to of the BMS's, so I even tried swapping between the two, and they both show the same lower than expected voltage on cell 1. I'm assuming there must be something I'm missing from the wiring perspective, but I'm at a loss for what it could be. Here's how I have it setup:
BC0 -> most negative
BC1 -> cell 1
BC2 -> cell 2
BC3 -> cell 3
BC4 -> cell 4
BC5 -> cell 5
BC6 thru BC19 -> cell 6
BC20 -> cell 6
BC21 -> most positive
Anyone else run into this issue, or is there something I'm doing wrong that I missed? Thanks!
BC0 -> most negative
BC1 -> cell 1
BC2 -> cell 2
BC3 -> cell 3
BC4 -> cell 4
BC5 -> cell 5
BC6 thru BC19 -> cell 6
BC20 -> cell 6
BC21 -> most positive
Anyone else run into this issue, or is there something I'm doing wrong that I missed? Thanks!
