Battery Error After Replacing Cells

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Hello everyone,

I'm having an issue with one of my batteries for my Phantom 3 Standard. For some context, I have 3 batteries, however I think I must've let them sit for too long as two of them experienced power failure after the individual cells dropped too low in voltage. To make a long story short, I opened up the batteries, removed the old cells, spot welded in new ones, and used the Battery Killer software to clear the power failure flag. After closing them back up, one of the batteries gives me a Battery Error message in the app accompanied by a motor overload message. The other battery seems to work just fine. I honestly can't figure out what the issue might be as from what I've seem, this issue is normally caused by something being wrong with the communication pins in the battery compartment, but since two of my batteries work just fine, I would think that's not the issue. Does anyone have any idea what the issue may be? I'm attaching some screenshots from the app to show exactly what I'm seeing.
 

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The uC in your battery doesn't seem to be responding.

If contacts are fine, then the uC either needs reset, or you've fried it while spot welding.
You may also check whether the uC is powered - it should always be working, even if the battery is off.
 
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Ah so the u was for "micro". That makes sense now. I actually just was on that Github page so see if I could figure out what it was.

Yes the battery button seems to be working fine. It lets me turn the battery on, shows charge, and even lets me see the battery health.
 

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