[quote name='RegalSin2020']Nintendo knew this and that is why they drop the gbc and gb gamepacks. Also the GB gamepack might be scrambled.[/QUOTE]
Naw, that hsa nothing to do with the price drops.
Batteries have only so long a life span, Regal. It often happens that the batteries used in cart games die at similar times, as they were from the same production run with the same life span.
It is possible to replace GB cartridge batteries, but I'd suggest picking up a copy of Fire Red/Leaf Green or Ruby/Sapphire if you find one cheap enough. If you enjoyed Yellow/Blue/Red/Crystal, I'm sure you'd enjoy the newer games. =)