WattCycle LiFePO4 battery can be used for 4,000-20,000 life cycles. Depending on usage, it can be used 10 years or more. At same time, we provide a FREE 5-year warranty. Lead acid and AGM get roughly 300-500 life cycles before their capacity is reduced substantially. Therefore, even though there is more upfront cost with a WattCycle LiFePO4 Battery, the upgraded saves you big in a long run.