1. With the original or approved batteries;
2. If the metal conductor such as jewelry, key or bead practice hitting a bare electrode of the battery, all battery may cause damage or personal injury. Please beware of is good battery, especially when put it in my pocket, wallet, or other metal container, special attention should be paid;
3. The charging shall be carried out in an environment of 5 ~ 40 degrees. If over the temperature range, the battery life is affected, at the same time may charge under rated capacity