Got the Z3 play from best buy few days ago for 350. Nice phone. Best phone I have had so far since 2007. But just curious what happens after say 3 years? Once the internal battery has reach 500 cycles or how many ever when its fully dead. Will I be able to still add a battery mod and boot from that once fully charged? Or does it not recognize the mod and there needs to be juice in the internal battery in oder for it to work? I forget what happened last night when I drained my internal.