Batteries with non-rectangular shapes for augmented reality devices, and systems and methods of use thereof

A metal-encased battery cell, comprising:

• an exterior surface that defines a non-rectangular shape, wherein:
• the metal-encased battery cell is configured to be housed within a temple arm portion, wherein the metal-encased battery cell tapers in thickness across two axes;
• and
• the non-rectangular shape of the exterior surface follows an interior shape of an internal surface of a temple arm portion;
• and
• the metal-encased battery is configured to be coupled with one or more artificial-reality processing or presentation devices, wherein at least one of the one or more artificial-reality processing or presentation devices is configured to receive power from the metal-encased battery cell.

A temple arm of an augmented-reality headset, comprising:

• a metal-encased battery cell having an exterior surface that defines a non-rectangular shape, wherein:
• the metal-encased battery cell is configured to be housed within the temple arm portion, wherein the metal-encased battery cell tapers in thickness across two axes;
• and
• the non-rectangular shape of the exterior surface follows an interior shape of an internal surface of the temple arm portion;
• and
• one or more artificial-reality processing or presentation devices, wherein at least one of the one or more artificial-reality processing or presentation devices is configured to receive power from the metal-encased battery cell.