The CMOS battery has maybe 100mA and lasts 5 years. A laptop battery has at least 400x the capacity, it would not drain in a few days.

Wow, he has to declare bankruptcy now!

That won’t solve the software side. My previous phone was still working, but then Google fucked up the software. The first because it required some new ssl standard for all connections that the phone didn’t support. The other one because google added a whole lot of local Infos, pictures and features to the map that could not be disabled, therefore rendering my Navi to a unresponsive, slow and battery draining app I could no longer use. And then there where some apps that would not run because my os was to old.