The battery is currently working, but it will gradually degrade over time and eventually reach the end of its lifespan.Therefore, we cannot guarantee the battery's lifespan. If it reaches the end of its life, we kindly ask the buyer to purchase a replacement separately. Please check the photo carefully and feel free to contact me if you have any questions before placing order! In case the destination is remote area, courier company charges extra fee, which will be on buyer's account. Based on weight and shape of each item, 13 kinds of cushioning materials are used for the sake of protection of the item and weight reduction. Unconditional return policy is offered to all buyers if notified within 30 days of the receipt of the item. Before placing the order please check with your local custom.