Lifespan refers to the number of years a battery can be used effectively, and can vary depending on a number of factors. Solar applications generally require one charge-discharge cycle of the battery per calendar day. A lead Acid battery designed for solar applications can provide around 1000 cycles which can roughly last for 2.7 years While Lithium-ion batteries can provide 3000 – 10,000 cycles, depending on the manufacturer, and can last up to 10 – 30 years.