Standby VRLA battery reserve life estimation

Knowledge of VRLA battery reserve life, in any application, is an ultimate goal of battery behavioral prediction. Most researchers are concerned about monitoring battery state of health (SOH) to determine if the battery is capable of performing. However, if the battery is found to have poor SOH then the operation of the telecommunications system is already in jeopardy and will remain that way until the old battery can be replaced. Thus the battery monitoring system has only marginally increased system reliability. The reserve life estimation scheme presented employs a number of SOH indicators. The SOH indicators include accumulated thermal stress, charge and discharge cycles, float voltage spread, float current trend, impedance, conductance, resistance, and indicators from within the coup de fouet region as well as capacity. Each SOH indicator has its strengths and weaknesses, which can vary depending upon the operating environment or battery failure mode. Test cases indicate that the scheme is capable of accurate reserve life estimation long before the end of battery life is reached.