Did I break the battery circuit?

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adafruit2
 
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Re: Did I break the battery circuit?

Post by adafruit2 »

can you power the NEW board without the USB cable attached, and plug the battery in securely - does it power on?

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bozzaglia
 
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Re: Did I break the battery circuit?

Post by bozzaglia »

I’m not sure I understand... do you mean power the new board with battery only? If so, yes it does power up... that’s how I got the battery discharged to try charging it again.
And what do you mean by “plug the battery securely”?
Or do you mean something different?

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dastels
 
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Re: Did I break the battery circuit?

Post by dastels »

With the battery connector inserted solidly into the battery socket on the Feather so it isn't loose or wiggly.

Dave

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adafruit2
 
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Re: Did I break the battery circuit?

Post by adafruit2 »

try removing the battery and powering with USB, then measure the voltage between the VBAT and GND pins - it should be ~4.2V (trying to charge the battery), just trying to figure out if its the battery or the charging circuit that is odd

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bozzaglia
 
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Re: Did I break the battery circuit?

Post by bozzaglia »

Done, voltage is zero :-O

I measured the other board as well (the one I think I fried) and it shows alternatively 0 and 0.1 V.

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adafruit2
 
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Re: Did I break the battery circuit?

Post by adafruit2 »

hmm - the battery circuit seems also damaged? not sure what happened here...did you perhaps plug in the wrong battery to both pieces?

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bozzaglia
 
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Re: Did I break the battery circuit?

Post by bozzaglia »

I’m positive I didn’t plug the wrong battery on this board. The closest that battery got was laying unplugged underneath the board while I was fitting the case. I’ll look carefully at the circuit for any broken or missing parts...

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bozzaglia
 
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Re: Did I break the battery circuit?

Post by bozzaglia »

These are closeup pictures of the two boards... I can’t spot anything wrong on them, but my eye is not so expert.
The board I plugged the wrong battery to is the one with the components attached.

The only other thing I could think about is that I got them both from the same distributor in Italy (who is now out of them!) and judging by the software version on these and other Adafruit boards I got from them, they could be a couple of years old....
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bozzaglia
 
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Re: Did I break the battery circuit?

Post by bozzaglia »

adafruit2 wrote: Sun Dec 04, 2022 12:28 pm try removing the battery and powering with USB, then measure the voltage between the VBAT and GND pins - it should be ~4.2V (trying to charge the battery), just trying to figure out if its the battery or the charging circuit that is odd
Today I read again the board primary guide and I understand the “BAT” pin carries the battery voltage when a battery is plugged in... so it should be zero with no battery hooked, shouldn’t it?

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dastels
 
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Re: Did I break the battery circuit?

Post by dastels »

The output of the charger is also connected to BAT.

Dave

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bozzaglia
 
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Re: Did I break the battery circuit?

Post by bozzaglia »

Ok! Did you have a chance to look at the pictures of the boards that I posted earlier? Maybe you can spot some damaged parts?
I’m not even sure where the charging circuit is...

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dastels
 
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Re: Did I break the battery circuit?

Post by dastels »

Hard to tell, but the 5-legged part sort of between the reset button and NeoPixel is the charger chip and looks like it might be discoloured/damaged.

Dave

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