Boots to retropie splash then shuts off
#13
(02-13-2018, 07:26 AM)r0ckarong Wrote: Why would the batteries appear to charge when the wires are backwards though? I left them plugged in with the leads the wrong way and after a few hours the green LED on the back came on indicating that they were full. When I reversed the leads and tried to boot I got the red "Low battery" led on the front immediately. What is the green LED on the back actually indicating if it's not full charge?

I think this was a bit of an artifact from the charging circuitry becoming "confused" in a way.

We built in reverse-polarity protection, so that nothing would get damaged if you hooked it up backward. That doesn't mean it will function properly in that configuration. Here's our best guess.

Hooked up backward, the machine won't run. When you hook up power to the charging port, there is a tiny bit of current draw when it tries to charge the battery (even though the reverse-polarity protection has kicked in). The charging circuit is "testing" the battery and thinks that it will try to charge it. The charging LED goes blue.

The charging circuitry also has a timeout "error" condition where it will set both blue AND green on. I think this is what will happen after it tries to charge for a while with no result. It may appear that the green LED is lighting up (because it is), but the blue LED will also (likely) be on in this error state.

What SHOULD happen (to the 2 back LEDs) is the blue LED indicates charging. When charged the blue should turn off and the green should turn on. If you see both blue and green, that's an error. This can sometimes happen if the microUSB power/cable doesn't supply enough amperage.

I'm guessing also that you saw the red LED on front, because the microUSB cable was powering your console, but the charging circuit thought that the battery was dead (in this case in the reverse-polarity shutdown state).
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RE: Boots to retropie splash then shuts off - by Flavor - 02-13-2018, 08:49 AM

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