I want to start this review by stating I work in a -30°c freezer for a minimum of six hours a day five days a week. these heated gloves liners work beautifully normally after two hours in the freezer my fingers hurt from the cold but these kept my hands warm on medium heat. I don't make reviews often but I thought these worked well enough that two of my coworkers decided to get them. The touch screen compatibility on these is nice when you have to use a scanner or phone in a freezer or in the winter (winter not tested but I'd assume) the battery life is good on medium heat I got four hours out of the gloves before I switched the batteries (the batteries didn't die I just switched them out because they where at 30%) if these gloves ever break I will definitely be buying another pair.