Real-time expected life on VRLA products-a manufacturers' perspective

In order to fully understand the life characteristics of valve regulated lead acid (VRLA) products, Yuasa-Exide Inc. is undergoing a large project to evaluate accelerated aging. Following the procedures of Bellcore's technical reference TR-NWT-001200 "Generic requirements for accelerated life testing of valve regulated lead acid batteries at high temperatures", we are starting to collect data on our 20 year warranty class VRLA products as well as comparable product offerings from three other prominent battery manufacturers in the industry. Utilizing the Bellcore small scale method to conduct our analysis, the intent is to demonstrate the predicted life performance of VRLA cells according to accelerated aging criteria. This paper discusses test results and the preliminary findings.