.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.The 18650 battery is cylindrical and has liquid inside. Because of the battery design and material, the 18650 is suitable for high current. Therefore, almost all notebooks and electric vehicles are designed with 18650 batteries; only the super notebooks are energy-saving, so 18650 batteries can be omitted. Instead, use polymer lithium batteries, especially tablet computers; digital cameras require high voltage and instantaneous high current for flash charging and discharging, so they can only use 18650 similar batteries, but they are slightly smaller. There are also many knowledge points on the selection of batteries. If your product requires a sample of the battery, please tell us as much information as possible, and we can configure a more suitable battery for you. 