After reading mixed reviews on just about all of these battery hand warmers I ordered a couple different ones and was not sure what to expect. This is actually my favorite one due to the shape, and it gets INCREDIBLY hot. almost too hot to the touch, but that's good for when I am wearing thin gloves, it's hot enough to feel through my gloves. My thick gloves however (knit with fleece inside) I can't feel the heat through. Sometimes I'll just take off my gloves and hold the warmer inside my pocket with my bare hands for a quick heat up. I've only been using it for a few days and always recharge it before it runs out so I'm not exactly sure how long the battery lasts but hope that it keeps working this well for a long time! If you get one that doesn't heat up much please return it and get a replacement coz it is a great product when it works correctly!!