8 years. Bought new in Reno, Nv in 2013. Moved to Boise, Idaho area after 4 years. Never garaged. To be honest, after about 6 years, there were a few times when we went to leave, and the battery was "dead". Put the charger on it a few minutes, and off we went. Always thought that maybe a light was left on, because it was very rare. Just decided to not push my luck after 8 years.