I searched around for threads on this but I only found info on SNES/NES battery replacement. I don't know if replacing the battery on a Sega Master System cart is the same thing, so I figure I should post this anyway.
I just picked up a complete Phantasy Star last week. Tested the saves out and they only lasted about 5 minutes before they were lost, so it looks like I need to replace the battery on it. Opened the cart up and see the battery but it looks like it's soldered in.
So how do I get this out? Which points do I have to solder?