The deep cycle battery weighs over 60lbs, something more substantial is need to ensure secure closure. So I took a good bit of filling out. With diet, exercise, and using the waist trainer, I have lost 2+inches off my waist in less than a month. I followed the suggestion from another review and peeled off the red side first. I sometimes wear them in the house when cleaning / doing dishes because its a lot better than being barefoot when it comes to PF. 3hrs to full from 25% on my S21. They do have the shaker holes so that is convienent also. Anyway, its only relevant if you live in a snowy mountainy area. These are perfect for, easy to install, excellent price. Unless youre 100% sure youre going to be drilling these directly into a stud, dont bother.