These 7.4V batteries are compatible with only Mobile Warming 7.4V Heated Jackets, Vests, and Baselayers. Compatible with Men's alpine bt jacket, men's backcountry heated jacket, men's backcountry heated vest, women's backcountry heated jacket, women's backcountry heated vest, women's cascade vest, men's company jacket, men's company vest, women's company jacket, women's company vest, men's frontier jacket, women's frontier jacket, men's phase plus hoodie, men's shift jacket, women's sierra jacket, men's vinson vest.