Retention features of a portable computer

A portable computing device is disclosed. The portable computing device includes a retention member that provides a force to a flexible circuit disposed in a top portion and a bottom portion of the portable computing device. The retention member limits movement of the flexible circuit when, for example, the flexible circuit receives a force in response to the top portion pivoting with respect to the bottom portion. The bottom portion of the portable computing devices includes a bottom case having multiple terraced regions. The terraced regions allow the bottom portion to receive additional internal components, such as one or more battery packs, a main logic board, and/or one or more speaker modules. The battery packs are secured to the terraced region via adhesive rings. Although the terraced regions require additional material removed from the bottom case, the internal components secured to the bottom case provide structural support.