Enablement of device power-on with proper assembly

An assembly configured for use in an electronic device, comprising:

• an intermediate circuit sub-assembly comprising a flexible printed circuit or a printed circuit board;
• a first battery pack comprising a first set of one or more battery cells and a first protection circuit module configured to switch power on and off from the first battery pack;
• a second battery pack comprising a second set of one or more battery cells and a second protection circuit module configured to switch power on and off from the second battery pack;
• a power bus disposed in the intermediate circuit sub-assembly;
• a first connector configured to operatively couple the first battery pack to the intermediate circuit sub-assembly and providing at least one electrical connection from the first battery pack to the power bus;
• a second connector configured to operatively couple the second battery pack to the intermediate circuit sub-assembly and providing at least one electrical connection from the second battery pack to the power bus;
• and
• wherein the first and second protection circuit modules are each configured to verify, as conditions to be satisfied prior to switching power output on to the power bus, that
• electrical continuity is established between the first battery pack and the intermediate circuit sub-assembly at the first connector, and,
• electrical continuity is established between the second battery pack and the intermediate circuit sub-assembly at the second connector.

A method of assembling a sub-assembly usable in an electronic device, the method comprising:

• using a first connector, electrically connecting a first battery pack to an intermediate circuit sub-assembly comprising one or more of a first flexible printed circuit or a first printed circuit board, the first battery pack including a first protection circuit module and a first set of one or more battery cells;
• using a second connector, electrically connecting a second battery pack to the intermediate circuit sub-assembly, the second battery pack including a second protection circuit module and a second set of one or more battery cells;
• using a third connector, electrically connecting the intermediate circuit sub-assembly to a main logic circuit sub-assembly, the main logic circuit sub-assembly comprising one or more of a second flexible printed circuit or a second printed circuit board;
• attempting to power on the main logic circuit sub-assembly;
• and
• if power-on is unsuccessful, disconnecting and reconnecting one or more of the first, second, and third connectors, and reattempting the power-on,
• wherein each of the first and second protection circuit modules is configured to sense a state of connection integrity at each of the first, second, and third connectors and enable power-on when connection integrity at each of the first, second, and third connectors is verified by each of the first and second protection circuit modules.