Now available from Tronixlabs Australia is Adafruit Feather - the new development board system that is thin, light, and lets you fly! Adafruit designed Feather to be a new standard for portable microcontroller cores.
To make it easy to use for portable projects, Adafruit added a connector for any of our 3.7V Lithium polymer batteries and built in battery charging. You don't need a battery, it will run just fine straight from the micro USB connector.
But, if you do have a battery, you can take it on the go, then plug in the USB to recharge. The Feather will automatically switch over to USB power when its available. The battery is also tied through a divider to an analogue pin, so you can measure and monitor the battery voltage to detect when you need a recharge.
We have the new Feather boards arriving as they are announced from Adafruit, and if you have any questions please email firstname.lastname@example.org or ask in the Customer Support Forum.