Hello,
I have bought a few Sparkfun Thing Plus C, and it’s an amazing board. My only issue is that I cannot get it to power up from my 1S LiPos. I bought them from Amazon: https://www.amazon.com/dp/B07TTD4817
What could I be doing wrong?
// Yoc.
My multimeter is arrving in the mail today, but I have tested the battery with a simple battery tester and it went “it’s charged, alright!”. Also threw them in a charger for a few hours at 3A, but that didn’t change anything… They’re brand new so I guess they come at storage voltage around 3,8v.
When using the [<MAX17043.h> (found [example on youtube where he uses it for the MAX17048) I get readings of 0%/0v when I have the battery plugged in and powered by USB. When i don’t have the battery plugged in, still powered by usb i get readings of 103.51%/4.08v.
// Yoc.](https://www.youtube.com/watch?v=mhmD-QA6kf0)](GitHub - porrey/max1704x: Arduino library for the MAX17043/44 and MAX17048/49 LiPo Battery Fuel Gauge.)
https://i.imgur.com/jJ5o3LT.png
Looks like the polarity is inverted compared to my batteries. I’m a complete newbie, so I had no idea this could be a thing. I would have thought that when you used something like a JST connector, there was some kind of standard. Did I buy the wrong batteries, or has the board been made “opposite” for a reason - or what’s the deal here?
What information was lost on me? :roll:
// Yoc.
Someone on the Arduino discord told me that there is no standard for this. A closer look at the jst connectors revealed that they had a little plastic tap so i could pull out the cables and swap them. So i did that - connected the battery and everything works like a charm.
Guess you can consider it solved now! 
Leaving the thread for other newbies like me so they can help themselves in the future :mrgreen: