hello, sorry to hear your having pain
yes mine is rechargeable , i have it tured on 24/ 7 and they tell me it is on the high end of the scale my settings?
i chargbe every week , i never let is get down completely , they other day it went to just a small smidgen left i thought it was going to run out,
My area get warm some times burning , it aches some times , but not enough to move it it is place in my back just above my hip , i am ovwer weight it does poke out some and i have noticed that there is ripples uner the skin now,
i was told 10 yrs they change it , but if you use it alot they will change sooner thinking that will be me. hope that answered you if not please let me know happy to help
have a pain free day