the battery is good for about minutes [SEP] we have been using this product for six months it works we feel the rechargeable unit is over priced the battery is good for about minutes the electronics are poor as you do not know the battery status or when the unit is recharged recharging takes many hours and you do not know when it is fully chargedwe would not purchase this product again but would consider the plug in unitthe pads are holding up much better than we expected lasting very wellit does an excellent job removing the dry skin and calluses we recommend the technology but not this model