LiPo Battery recommendations?

[MVCutter]

So I picked up a couple of these batteries https://www.amazon.com/gp/product/B07S75L945 to power some M0s. Unfortunately as soon as a plugged it in, the little magic puff of smoke escaped the M0 so it no longer works. I tested the output V on the battery and it came out to a steady 3.85v.

What am I missing? I'd like to use the JST power option, but I don't want to burn up more boards... any help for a noob would be appreciated.

Thanks

[sparky]

Did you verify the polarity? 

Edit: I just checked out your link; the battery pictured is the wrong polarity.

[TomWS]

So I picked up a couple of these batteries https://www.amazon.com/gp/product/B07S75L945 to power some M0s. Unfortunately as soon as a plugged it in, the little magic puff of smoke escaped the M0 so it no longer works. I tested the output V on the battery and it came out to a steady 3.85v.

What am I missing? I'd like to use the JST power option, but I don't want to burn up more boards... any help for a noob would be appreciated.

Thanks

Unfortunately, while the 2 pin JST connector is pretty common for LiPo batteries, its wiring is NOT standardized and you will find batteries wired both ways to the two pins.  Most common RC/Drone batteries are wired opposite to common electronic boards (from Sparkfun and Adafruit for instance) and, without checking the connector before plugging in there is a high probability of frying your board due the voltage wired backwards.  The worst part is the high current capacity of most LiPo.  Virtually guaranteed to kill your board...

The 'solution', if you haven't fired your board (you probably have), is to match the polarity before plugging the battery in and, if it's reversed from your board, you can remove the crimp pins from the plastic housing (be very careful not to short the exposed pins) and 'use the jst option'.  What you can't do is rely on the next random battery with the same connector matching your board.

[MVCutter]

Got it, I see the issue now... thanks for the reply and explanation!

[Kilo95]

I have cut the leads coming from the battery, reversed them and soldered them back together so the polarity of the plug is correct for the moteino. just a thought

[MVCutter]

I can just swap the wires easy enough by sliding them out of the connector... I just didn't even think to check the polarity... I assumed it was good... my mistake!

[TomWS]

I assumed it was good... my mistake!

You might wonder how the rest of us know about this... DAMHIKT!   

UPDATE: and it not specifically a Moteino M0 problem.  It's pretty common in the hobbyist market.