About this item This battery is applicable to electronic products with DIY 3.7-5V less than 15.54Wh 4200mAh.（★ Not applicable to high-power electric tools and model aircraft） Please compare the connector specifications and polarity according to the display diagram before purchasing,★the red wire is the positive "+" and the black wire is the negative "-"，Do not reverse-charge or reverse-connectreverse. ★The primary battery of some products has no plug or mismatched plug or
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