On the back is an optional JST connection that can be soldered with a JST PH-2 socket for powering the module with a battery such as one of {{sl|lipo|accus Lithium Polymère}}. When a battery is plugged in, the '''Vin''' breakout pin will act as a power output and can be used to power your microcontroller. | On the back is an optional JST connection that can be soldered with a JST PH-2 socket for powering the module with a battery such as one of {{sl|lipo|accus Lithium Polymère}}. When a battery is plugged in, the '''Vin''' breakout pin will act as a power output and can be used to power your microcontroller. |