So the idea is that when the battery dies down she can replace it with a new one and then she can continue using her cellphone normally again.
Can’t the phone have rechargeable battery? I’m sorry if I misunderstood, but you mentioned that once the battery dies, she has to purchase new. I hope you feel good.
We have to purchase a new battery for her old phone from a province far fro us so it is not feasible for us to do.