A small electronic device has a battery level detection unit for real-time detection of the current battery level and a communication unit for transmitting report data on a detected battery level to another small electronic device, such as a pocket PC device. The receiving small electronic device compares the data with data on its own battery level detected therein and displays the lower battery level data.

 
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> Overdischarge preventing circuit apparatus for a nonawueous electrolyte secondary battery, overdischarge preventing circuit apparatus for a battery pack, secondary battery overdischarge preventing method and overdischarge preventing method for a battery pack

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