The chemistry of a solar battery and how consumers use it heavily dictate its lifespan. Deep cycle Lead-Acid batteries have a lifespan of 3-5 years. Lithium-Ion batteries, especially those incorporating LiFePO4 chemistry, can last 10-15+ years of 2000-5000 cycles. Employing good maintenance practices, like operating the battery within the recommended temperature range, can extend lifespan. Using advanced battery management systems also optimizes performance and lifespan.