Lifecycles refer to how long batteries maintain their rated capacity. When you completely drain a battery from 100% to 0%, you’ve gone through one cycle, and the lifecycle rating for batteries is dependent on its type, or chemistry. Lead-acid batteries are rated for 200-300 lifecycles and lithium batteries for 500-800 cycles. Yeti Lithium batteries are rated for 500 cycles to 80% capacity. This means after 500 full life cycles from 100%-0% you will still have 80% of the original rated capacity. We expect well over 2000 life cycles on the unit. With the new Yeti X line, you now have the ability to control your battery performance to increase its lifespan.