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A rechargeable battery arrangement in which total service capacity for discharge from full charging to a final discharge voltage varies according to discharge conditions for discharging charged electric charge, comprising: an integration member which integrates quantity of electric charge discharged

A rechargeable battery arrangement in which total service capacity for discharge from full charging to a final discharge voltage varies according to discharge conditions for discharging charged electric charge, comprising: an integration member which integrates quantity of electric charge discharged between a point of start of discharge after charging and the present; a data storage member for storing a plurality of total service capacities for discharge at a plurality of values of discharge current, respectively in unique association with a specific one of the total service capacities for discharge at a specific one of the values of discharge current; a current detection member for detecting a present value of discharge current; and a calculation member which obtains, from data obtained by the data storage member on the basis of the present value of discharge current detected by the current detection member, a total service capacity corresponding to or closest to the present value of discharge current and calculates, from the total service capacity and an integrated value obtained by the integration member, a residual capacity of electric charge for discharge.

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[ What is claimed is:] [1.]1. A rechargeable battery arrangement in which total service capacity for discharge from full charging to a final discharge voltage varies according to discharge conditions for discharging charged electric charge, comprising:an integration means which integrates quantity o

[ What is claimed is:] [1.]1. A rechargeable battery arrangement in which total service capacity for discharge from full charging to a final discharge voltage varies according to discharge conditions for discharging charged electric charge, comprising:an integration means which integrates quantity of electric charge discharged between a point of start of discharge after charging and the present;a data storage means for storing a plurality of total service capacities for discharge at a plurality of values of discharge current, respectively in unique association with a specific one of the total service capacities for discharge at a specific one of the values of discharge current;a current detection means for detecting a present value of discharge current; anda calculation means which obtains, from data obtained by the data storage means on the basis of the present value of discharge current detected by the current detection means, a total service capacity corresponding to or closest to the present value of discharge current and calculates, from the total service capacity and an integrated value obtained by the integration means, a residual capacity of electric charge for discharge.