In an electronic component including an outer housing and a control unit inserted within the outer housing, the control unit includes a base, a printed circuit board mounted on the base, a battery holder mounted on the base for removably holding a coin-shaped battery which includes terminals connected...http://www.google.com.au/patents/US6600525?utm_source=gb-gplus-sharePatent US6600525 - Electronic component having a liquid crystal display and holding a built-in battery
