The Adafruit Feather comes with an in-built battery charger.
Simply plug in the battery into the Feather and then plug in a powered micro-USB cable. The battery will start charging and you will notice the charging status YELLOW LED on the Feather turns ON!
Check out this FAQ for details on how long it may take to charge your battery.
The on-board charging circuitry on the Feather limits the charge current under spec so users can plug the Feather into any powered USB port to charge the battery through the Feather.
Additionally, if you want to charge multiple EmotiBits together, you can use powered USB hub. This removes the port limitations that you may experience using a laptop/computer! The battery charger circuitry on the Feather limits the charge current to ~200mA. Choosing a USB hub that is spec'd to provide at least 200mA per USB port will ensure the battery is charged at the maximum rate allowed by the Feather.
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