it is very cold in winter, so if we can make a battery heated clothing. the winter would not cold again. firstly , you need to prepare a heated pad, for the heated pad you can buy from the market, and than you can sew the heated pad to your jacket or vest. and than you need to buy a battery box. we recommend to use the AA battery , it is cheap , and easy to buy , we use 6pcs AA battery , the voltage would be 9V, and than you can connect the heated pad with the battery box. it would be work well. the only thing is that how to get the heated pad, we can supply it . you can sent me a email : email@example.com. you also can refer this website: http://www.pcamwayheat.com they can supply the heated pad and some accessories. they also can tell you how to DIY the heated gloves, motorcycle heated jacket etc. following is the heated pad pciture, you only need to sew it to you jacket . and than ,you can use a 5V,2A USB, power bank as the power, please make sure the power bank's Max output can be reached to 2A, so that the it is warm enough. you also can get the the heated pad for neck pain, waist pain, shoulder pain, knee pain, etc, this heated pad is very cheap. you dont need to buy the battery , you only need to connect it to the cell phone charger or the power bank. you can vist :http://www.pcamway.en.alibaba.com/product/60462404... , to get the heated pad which you need .