NOVELTY - The battery cell (100) has a jelly roll (102) with layers that are wound together. The cathode with an active coating, a separator, and an anode with an active coating are included. A pouch is provided for enclosing the battery cell. The jelly roll is sealed in the pouch. A mechanical support structure (114) is provided within the pouch to surround a portion of an outer surface of the jelly roll. The outer surface of the jelly roll is included with an ends and a central region. The pouch is formed by folding one cup over another cup.    USE - Lithium-polymer battery cell for use in portable electronic device (claimed) such as portable media player such as MPEG audio layer-3 (MP3) player. Uses include but are not limited to laptop computer, appliance, peripheral device such as trackpad, touchscreen, display, mouse, camera, keyboard, and user-interface device, subnotebook or netbook, tablet computer, cellular telephone, unit of testing equipment, network appliance, set-top box, personal digital assistant (PDA), controller, digital signal processor, game console, consumer-electronic device, etc.    ADVANTAGE - The mechanical support structure is provided within the pouch to surround the portion of outer surface of the jelly roll, thus the external forces can be dispersed efficiently, and the good alignment of the electrodes can be maintained. Hence, the external battery-cell housing can be removed safely so as to maximize energy volume without compromising run-time and reliability, by protecting the lithium-polymer battery cell from external forces such as vibration and mechanical shock. The space within the portable electronic device can be efficiently used by the battery cell.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) a portable electronic device; and    (2) a method for manufacturing battery cell.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the battery cell.    Battery cell (100)    Jelly roll (102)    Sealing tape (104)    Set of conductive tabs (106)    Mechanical support structure (114)