Hi everyone. I'm new to the forum and wasn't sure where to place this question, so I thought I'd play it safe and post it here. I'm gradually building my understanding of electronics with little projects here and there. I have an old Sony CMD-Z5 (circa 2000?) mobile phone which I still use daily as my foreign phone.


It has a rather unique battery design in that the battery is built into the back compartment itself, which snaps out to be replaced. I changed the battery about 8 years ago from new old stock, but obviously its hold of charge is pretty crappy.
Since buying any new old stock again would only be buying a battery which was already old, I was wondering could I crack open the battery compartment and wire up a brand new battery? The battery used is a Li-ion 3.6v 600mAh. Is something like this even possible?
Any advice much appreciated.