Remaining battery energy indicating instrument

A remaining battery energy indicating instrument comprising:

• a detector detecting a predetermined discharged time and a predetermined fully charged time of a battery for storing electric energy;
• an integrator integrating the amount of electric energy which has been charged and discharged, said integration means utilizing an integrated value corresponding to an amount of electric energy stored in the battery at the predetermined discharged time and the predetermined fully charged time when the predetermined discharged time and the predetermined fully charged time are reached;
• and
• a display device displaying the absolute value of a remaining amount of electric energy stored in the battery based on an output signal from said integrator.

A method of detecting a remaining battery energy comprising the following steps:

• detecting a predetermined discharged time and a predetermined fully charged time of a battery for storing electric energy;
• storing as an integrated value corresponding to an amount of electric energy stored in the battery at the predetermined discharged time and the predetermined fully charged time when the predetermined discharged time and the predetermined fully charged time are reached;
• integrating electric energy which has been charged and discharged based on said integrated value;
• generating an output signal from said integrating of said electric energy;
• and
• displaying the absolute value of a remaining amount of electric energy stored in the battery based on said output signal from said integrating of said electric energy.