The battery cells of all Youli battery pack are with high quality, including the Chinese top brands and imported branded battery cells from all of the world. One year warranty are guaranteed by Youli.We provides customers with solutions for different device application. All products will be inspected in the testing system for 100% test.Our goal is to be one of the excellent OEM and ODM suppliers for assembling battery packs and power supply globally, provides the best quality, complete battery and power supply models with prompt service to every customer. Please do not hesitate to contact us for any battery requirements.