| http://www.w3.org/ns/prov#value | - In Step S330, the sub-controller 63 calculates the remaining battery power at the present point of time, and an estimated charging time required for the battery reaching the full-charged state, based upon the information such as the remaining battery power at the point of time of the start of the charging operation, the output current of the constant current circuit 66, the counting value of the c
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