Let's start with a weird image first:     In the plastic box is an Olimex A20-Lime2, a 2.5" HDD with 2TB and Olimex' largest battery with 6600mAh. Mounted on the top cover (box standing on the side) is a Banana Pi M2+ (to be replaced with NanoPi M1 or OPi One/PC in the future)   Why Lime2? Since this board from our friends at Olimex is designed intelligently and provides DC-DC step-up converters on the board providing the ability to power also the connected SATA dis