Studies into the capacity retention behaviour of VRLA batteries used in telecommunications applications

This paper reports on the results to date of a study into differences in the float behaviour and capacity retention characteristics between 48 V battery banks composed of 2 V cells and 12 V monoblocks. A comparison of the float voltage behaviour observed by continuous logging and capacity trends over time determined by annual intervention discharging is presented. Considerable differences in the capacity retention behaviour over the first 30% of rated service life between the two types of batteries have been observed