The LEDs have a 50,000-hour lifespan. (That’s over 5 years of continuous use!) The lenses are made from ultra-durable polycarbonate glass to prevent cracking or wear from the weather and are fully water and dust-proof.    The batteries are made from Grade A lithium-ion cells that are rated to last for at least 500 cycles before degradation begins. With proper care and use, expect to replace the batteries after 700 to 800 cycles. Eversun will continue to supply customers with batteries after the 1 warranty period ends.