Patent ID: 7615006

Claim:
An electronic endoscope for photographing an image of a region to be inspected of a subject, said electronic endoscope comprising: a battery section including a battery for supplying electric power; and a rewritable memory provided in said battery section, the rewritable memory including a charging time section, the battery section further including a charge controller that charges the battery, a timer connected to the charge controller that measures a time for charging the battery, and a writing controller connected to both the timer and the charge controller, wherein the writing controller writes the measured time for charging the battery from the timer to the charging time section of the rewritable memory, wherein said rewritable memory additionally stores a relation between a discharge voltage and discharge time of the battery as a data table or as an arithmetic expression, the electronic endoscope further comprising: a remaining-power calculator for calculating remaining power of said battery based on at least the relation between discharge voltage and discharge time of said battery, and said charging time and the number of times of charging the battery stored in said rewritable memory.