The manual mentions cold weather conditions and insulating to keep the battery in good condition, but nothing on hot weather? Would the cells degrade if the lithium battery was out in direct sun especially during summer?
Every battery including lithium, have a listed operating temperature range, in which they will perform at the highest efficiency. Goal Zero Lithium Power Station's have an operating temperature range of 0-40C. As long as you are camping within these temperatures, your Goal Zero Lithium Power Station will perform at it's highest efficiency & remain in good condition.