This technical report is applicable to lead-acid vented and valve regulated batteries, for use in stationary battery applications. The object of this technical report is: – to assist users in the selection of methods to obtain sufficient information to indicate the state of health of an operating stationary lead-acid battery; – to achieve this by describing characteristics that can be electrically measured and remotely interrogated on a regular basis; – to indicate the sensitivity and reliability of the measured data and to provide the user with methods of interpretation; – to provide users with good operating characteristics and general guidelines