[Water Warrior 2]

3 or 4 years is common battery life. The longest I've have heard is 7 years but that was exceptional in my opinion. A lot of factors will determine battery life. Temperature, times discharged, amount and duration of riding will have their own effects. Added power hungry farkles will not allow proper charging on short rides. Use of a Battery Tender is helpful if there is any doubt about proper charging if short rides are common.