Meet the relevant national standards and requirements for batteries All finished battery products are calibrated and tested before delivery. They can be used directly and normally.Our lithium batteries are brand new and usable, and our lithium batteries are configured according to customer needs. Our lithium batteries have quality problems (except for man-made and uncontrollable reasons) within one year from the day you receive the goods, which can be guaranteed or returned. Our products are produced in strict accordance with quality standards. Our lithium batteries comply with IEC international standards, comply with GB national standards, and support national certifications, such as CE, UL, CSA, CEE, VDE, PSE, KC, and so on. This 3.7V 5200mAh lithium battery can be used in many applications, such as home appliances, toys, and consumer electronics. If you have requirements on wiring, wire, packaging, current, discharge, etc., you need to communicate with us immediately, let us know your requirements, and we can configure a more suitable battery for you according to your requirements. We hope that the good quality of our batteries can bring you better performance, which is our goal. 