There is a small hole on the side of the handle, which is pushed in with a metal stick, such as a paper clip with a straight V-shape. There are two kinds of battery covers used in the history of signature lights. The old one can be completely ejected and removed. If so, you can push hard. However, if it is a new type of warehouse cover that can only be opened at 90 degrees, we must be careful not to use too much force. Pay attention to the positive and negative directions of the battery when ejecting. The battery is CR 1025. After installing a new battery, if it is an old-fashioned cover, press the cover tightly according to the shape of the gap. If it is a new cover that can be opened 90 degrees, just press it directly.