PORTABLE BATTERY FOR A WEARABLE DEVICE CHARGER

Methods, systems, and devices related to a portable charging case are described. For example, a portable charging case is described that may convert a ring size-specific charger for a wearable ring device into a portable charger. The portable charging case may include a housing with a bottom portion that houses a battery and related circuitry, a top portion, and a retaining bracket that may hold the ring size-specific charger in a cavity within the bottom portion. The portable charging case may include a power providing component that may transfer charge from the battery to the ring size-specific charger. A user may accordingly place the ring size-specific charger within the cavity such that a power-receiving component of the ring size-specific charger is coupled to the power providing component of the portable charging case, which may enable the user to charge the wearable device without use of a wall outlet.