On-Line Diagnostic Technique for VRLA

VRLA group used in communication power sources was operated under conditions of floating charge for a long period of time .Because it was tapered failure,the high-low values and uniformity of floating voltage ,and the large-small values and tendency of floating current for all of single cells in the battery group could provide the important informatiom about the state-of-heath of battery group .Statistical results had showed that the remainder service life of this VRLA group would only be 1/3 of the over all,as soon as the uniformity of floating voltage became worse and the floating current became larger and larger.