Never charge more than 4.2v or discharge more than 3v per battery. Both of these conditions can cause permanent damage to the battery. If the battery expands during use or charging, it indicates that the battery has been damaged and can no longer be used.

　　Safe storage

　　For safety reasons, lithium batteries are usually best stored at room temperature, placed in a metal box or lithium battery fireproof injection storage container. If you won't use a fully charged battery for a few days, keep the battery at 40 percent when you leave it, and fully charge and discharge the battery every month. Lithium batteries do not have a "memory effect", if placed for too long, lithium batteries may no longer charge.

　　Avoid heat and cold extremes

　　The temperature affects the performance and life of the battery. When you charge, make sure to do it at room temperature, which means not in a cold garage or basement, or near direct sunlight or heat sources. When you charge or use a lithium battery, make sure it is at room temperature, and if the battery runs out of power, make sure the battery has cooled before charging.

　　Keep the battery clean

　　The drone gets dirty, the battery gets dirty and it affects performance. Keep the drone battery box and battery connector clean. If the battery contact point becomes dirty, use a soft brush to clean it.

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