Once I researched it has battery which need to be soldered...manual says "bring camera to service for battery renewal". Can't say for dimensions, so also not sure which could type be used instead of original in case can't obtain it.
Oh, this is from subclub - "The built-in A2/3 lithium battery is large (about the size of your index finder) and designed to last about five years. At that point, the manual instructs you to take it to a repair shop."
Currently I can't find it, but remember seeing cilinder-shaped lithium batteries with wires at the end, obviously to be soldered.
As I had already AA-35, just skipped TW-3...hope you'll find replacement battery.