Which looks promising with one glaring fault: this appears to only be a battery charger. I am unsure if I could use this circuit to charge the battery, and also power the device, at the same time.
adafruit_support wrote:1) Yes. If they used the same wall adapter for power, they would have a common ground and you couldn't connect them in series.
2) The circuit you posted appears to be designed for that purpose. Connect he charger as shown and connect the load in parallel with the batteries.
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