no batteries only last 4h they say i chech my in test i say 2 3 tops there no way to keep it warm always ready un less you keep it tap to body armpit to keep it warm i have same problem looking for way to pass radom .maybe their a way u can plug it in to the wall outlet with convertor maybe but it will burn out heater after a while.body heat the only way i can see.sucks to have to tap a bag of piss to yourself every day.imp: