the ups board I'm using for the allows one to query the voltage and charge level of the battery, but using the change in voltage over time fluctuates too much to know whether or not it's hooked to a charger, but the board itself knows, since it starts blinking the appropriate charge level indicator LED, so I'm thinking I can find a signal somewhere on the board to feed to yet another gpio pin for a charging indicator. hmmmm.

@djsundog it's not much a problem either, if the led is driven high, you could use an optocoupler, might be better to avoid ground loops or naughty things between the ups and the pi

Much smaller. Makes sense. I'm looking at the other for the eMate, using 18650s where I have much more room.

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