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1. A method comprising:
providing a first case portion of a smartphone case comprising a base front surface and base back surface, wherein a housing of a smartphone will be placed against the base front surface; enclosing a battery between the base front surface and base back surface; connecting electronic circuitry to the battery, an inner connector, and an outer connector, wherein the inner connector is adapted to interface with a connector of the electronic device; providing a second case portion for the electronic device case that couples onto the first case portion; forming at least one sound channel in the case between a bottom inner side surface comprising the inner connector and a bottom outer side surface comprising the outer connector; forming inside audio openings on either side of the inner connector, wherein the inside audio openings are coupled to the at least one sound channel; and forming outside audio openings on the bottom outer side surface, wherein the outside audio openings are coupled to the at least one sound channel, the outside audio openings are adapted to receive sound waves from outside the case, and the sound waves pass through the sound channel to the inside audio openings, thereby allowing the sound waves to be received by a microphone input of the smartphone.
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