Koolio runs on two isolated power systems.  The first one is used for the electronics and other is used for the refrigerator and motors. When it docks, the microcontroller will switch via relays, transistors and opto-isolators Koolio from battery power to wall power while isolating the batteries from the power system and charge them. This is done without ever losing power to the main electronics board.  

Figure 7 Picture showing components used in docking station



Ramp Mechanics




Figure 8 & 9 Final Product Design of Docking Station