Abstract: A portable computer having a partially sealed cooling system is disclosed. The portable computer contains heat transfer materials that function to remove heat from a sealed area of the portable computer to an unsealed area where the heat may be more effectively dissipated. A portable computer having a power source shield is also disclosed. The shield may be formed to partially surround a portion of the power source, and may be formed by partially enclosing a power source in a conductive material; forming an opening in the conductive material on one side of the power source; installing the power source near an edge of the electronic device; and orienting the power source so that the opening faces the edge of the electronic device.