Wednesday Posted June 6, 2021 Report Share Posted June 6, 2021 I recently built a DNA250C using dual 20700s but as I run the battery analyzer the USB current keeps fluctuating up and down, without allowing the analyzer to start. I've tried making the max voltage of the batteries 4.17v to force it to start but that hasn't done anything. Is there any ideas about why this is happening? Could I have messed up some soldering at some point? Link to comment Share on other sites More sharing options...
Wayneo Posted June 6, 2021 Report Share Posted June 6, 2021 Your image does not show up. I've seen that before on my Mac. I usually delete that link and hit the return key once. The image should still be in the box below. By clicking the + sign in the image it should appear. 👍 Yes, it could be your soldering. I'd start down at the JST connector area (where you would have bridged those pins). Welcome. Link to comment Share on other sites More sharing options...
Wednesday Posted June 6, 2021 Author Report Share Posted June 6, 2021 (edited) Here should be the image of what is happening (hopefully). And thanks for the help, I might tare it appart and take a look soon. Edited June 6, 2021 by Wednesday Link to comment Share on other sites More sharing options...
BillW50 Posted June 6, 2021 Report Share Posted June 6, 2021 It looks like it is waiting to be charged to 4.20v to me. It shouldn't take more than a 15 minute wait (unless it is balancing). Here is a video of using the battery analyzer. Link to comment Share on other sites More sharing options...
Wednesday Posted June 6, 2021 Author Report Share Posted June 6, 2021 8 minutes ago, BillW50 said: It looks like it is waiting to be charged to 4.20v to me. It shouldn't take more than a 15 minute wait (unless it is balancing). Here is a video of using the battery analyzer Thats what I first thought, but I've left it like that for extended periods of time without it moving onto the next steps, the highest the analyzer has charged my batteries is about 4.17-4.18. And on that point, changing the discarge profile to a max of 4.17 wasnt doing anything to help the analyzer start. Link to comment Share on other sites More sharing options...
Wednesday Posted June 6, 2021 Author Report Share Posted June 6, 2021 Well I opened up the mod and checked if any of the areas around the JST were shorted which they were not, but I reflowed some solder and it has gotten it working. In the battery analyzer it got 1 battery to 4.20 and one to 4.18 before starting to run the test, which I assume is fine. 1 Link to comment Share on other sites More sharing options...
Wayneo Posted June 6, 2021 Report Share Posted June 6, 2021 Good job, now you can figure out if it's the cell itself or the sled. 1 Link to comment Share on other sites More sharing options...
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