Battery with coulometric state of charge indicator

An electrochemical cell housed in a container and having a coulometric charge indicator device, said coulometric charge indicator device comprising a first electrode capable of being electrochemically dissolved, an electrolyte disposed in contact with said first electrode and a second electrode in contact with said electrolyte and being capable of receiving the dissolved first electrode;

• said coulometric charge indicator device connected in parallel across a current path of a resistive segment of said cell so that when the cell is being discharged a current will flow through the resistive segment thereby providing a voltage across the coulometric charge indicator device so that said first electrode will dissolve and be transported through the electrolyte and deposited on the second electrode and wherein the amount of the first electrode deposited on the second electrode can be used to indicate the capacity of the cell.