These batteries are the industry leader in the Critical Power Industry. They carry a four-year warranty (3 Full, 4th Year Prorated). We bridged the gap between design life and service life. After all, what good does a spec do on the drawing board if real world results do not match up? These new "Elite" brand of GPS batteries were designed to surpass all battery brands and are well suited for stringent UPS and electronic applications requiring ultimate reliability and life.