A mobile phone includes an external power supply terminal receiving power from the external power supply, a secondary battery charging at least part of the received power and supplying the charged power to a load, a radio circuit receiving power from the secondary battery and allowing transmission power to be varied, and a control portion detecting the transmission power level of the radio circuit and switching to any of a plurality of charge modes having different time periods for charging the secondary battery, based on the detected transmission power level.

 
Web www.patentalert.com

> DETECTION APPARATUS AND IMAGE FORMING APPARATUS

~ 00398