Backup Battery Question

Hi
I've been asked to get a Titanium up and running which has been left in a storage cupboard for years. After reading through this forum it's becoming obvious that the reason it won't power up or charge the main battery is because the internal backup battery has run flat. I've tried a few suggestions such as resetting the PMU, leaving the power cord plugged with the main battery removed, etc, but after a few days of this I think replacing the internal battery is the only way I'm going to be able to revive the machine.
I've downloaded take-apart instructions and am fairly IT competent so I'm not put off by this, but I'm confused as to which battery part code I should order - there's three different ones for the Titanium. I don't have any documentation for this machine and as I can't start it I can only say it's the 500Mhz model with a VGA connector on the back.
Does anyone know which battery I should order?
Thanks =0)

Took the plunge and opened the case up - was able to get correct part number by searching on Google using code stamped on backup battery =0)

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