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Name: No. 7 to No. 5 Battery Conversion Cylinder (Negative electrode with Bottom)
Weight: Approximately 4g

First: The new model adopts a more flexible PP material, which has higher strength and toughness, no longer cracks, and greatly increases the service life. At the same time, the shell is treated with a matte semi-transparent effect, which is less prone to wear and tear and looks old.

Secondly, the mold is designed with protruding fixed slots, which enables the connection at both ends to no longer rely solely on the precise fit of materials for fixation.

Thirdly, the negative electrode is directly exposed using the negative electrode of the No. 7 battery.

Fourth, the newly designed positive electrode (marked with "+") adopts an elongated pure copper nickel-plated positive electrode cap, which is compatible with appliances with deeper positive electrode slots. Meanwhile, the internal part of the adapter tube and the contact area with the battery are enlarged, significantly reducing the contact resistance

The No. 7 to No. 5 cylinder can utilize No. 7 batteries as No. 5 batteries. In daily use, when the No. 5 battery runs out of power and there happens to be a No. 7 battery at hand, this one can come in handy. The weight of the No. 7 battery is relatively light. After conversion, it can be used in devices such as wireless mice, and the usage effect is good. In other circumstances, with him around, there will be one more option and one more way to solve the problem!