Reviving this old thread in case someone has that pdf - the link is broken/server error right now.

I want to try and replace it and need to know its model no. or at least the specification (voltage etc.)

Have taken the board out of the n900 with the cell battery, but it seems bonded (or has done over the few years I've had the phone) to the terminals. Its useless anyway (phone forgets time in <0.3second when switching between batteries ie. unless I'm perfectly sliding newly (externally) charged battery in each time all aligned), so doesn't matter what I do with it as long as I don't break anything else.

I might try warming the terminals with a soldering iron, see if that loosens. But either way I don't think I can read anything the battery may have previously had on it regarding type code; I don't recognise its size, its tiny.

Anyone know the BIOS battery type/where to get replacements (ideally in the UK, but don't care much)?