| 摘要 |
PURPOSE: A cellular phone which is not turned off is provided to prevent power from cutting off when replacing a battery. CONSTITUTION: When an external battery (2) is turned off, an automatic converting circuit (3) automatically converts a power supply method from the external battery into an internal battery (1). A user does not need to turn off a cellular phone. If the external battery is separated, an external battery mode is automatically converted to an internal battery mode so that the power source is supplied to the longest several minutes. [Reference numerals] (1) Start
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