In an electrical device, for example a cordless mobile part (MT.sub.me), having an electrical energy store (AKK), for example a rechargeable battery or a battery, in order to indicate neither too early nor too late the "low energy store" state in the interest of utilizing the stored energy optimally...http://www.google.com.tw/patents/US6121754?utm_source=gb-gplus-share專利 US6121754 - Method for displaying a "low battery" state in electrical equipment with electrical energy stores and electrical equipment with electrical energy stores with means for displaying a "low battery" state
