Generally, most of our external batteries' static power consumption is very low, which can last around 1 year to drain the battery completely if they are not used.However, the chemicals within the li-ion battery will gradually become less active over prolonged periods without use. Most will die in 2 years of inactivity.To extend your battery's life:1. Use and recharge Power Bank at least once every 3 months.2. Do not over-charge or over-discharge it. It is best to keep it charged between 5%-95%