I am bought a Lenovo 13000 mah power bank. The design and price of product is very attractive but it worst quality product so it have taken lot of time for charging.its output normally goes to 6000 to 7000 mah. However it pin is always having problem while charging. It’s also discharged self if u leave this for 5 to 6days on power off mode on. So could not believe this brand or product.