Bought a new one 2 years ago to replace one that was 5 years old with no problems. Had a fellow racer smoke his gel battery at the track. I gave him my keys to my shop, he went and picked up my seven year old used battery. I told him if he charged it up it might make the race, since I hadn't touched it in 2 years. He brought it back to the track put it in his car and it fired his engine without even a charge. He gave me fifty dollars so that he could keep it after the race. They just keep going, and going.