It's deffo something people should give thought to, as Richie says, leaking batteries are a nightmare, remember it's pure acid, it rots the board VERY quickly. Must admit, I don't remember seeing a battery on the PS3 motherboard, but then again, the one I have is a very early model and much of the board etc is totally different from later PS3's. Maybe they are using caps to hold charge. Might have a 2nd look.
But yeah, a little pictorial of showing what to look for and maybe a link to the usual replacements, pretty sure they are almost universal. Nice one Richie, I've seen some pretty awful Amiga boards that had battery leak, just eats the VIA's, copper is it's favourite nosh as well as any metal.
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Not old. Vintage. :)