Abstract
In order to rationalize the maintenance of batteries, we began the development activity of the equipment to evaluate the deterioration of batteries. The developed equipment can measure the battery characteristic with relation to residual capacity. We call this battery characteristic Vmd. The equipment has so useful advantages that users of the battery system can measure Vmd of all individual cells on operating condition of the battery. Here, we introduce considering of the development, qualification of the equipment to apply to the operating battery in our site, and the rationalization of the maintenance criteria of the battery.
