I Made Electric Warming Boots Insoles For Girlfriend ( DIY)

DIY Electric Warming Boots Insoles for degree. It is working for 1, 5 hours, using 5V Power Bank (18650). I used: 1) Batteries Liion 18650, 3. 7V, 3400mAh by Liitokala (I ve tested it on my battery charger, it is realy 3400mAh): 2) Power Bank Case (5V, 1A): 3) Heating Wire. I used 0. 4mm and 65cm for 5 degree. It takes 5V, 0. 75A for one foot. 4) Wool Insoles like this: s. cl