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There are two batteries - One is the main battery which you can replace by removing the battery lid, the other is a backup battery which is located inside the device, either you send it to a tech place to have it replaced or you can remove the case to get at it, been a long time since I read about it but I think after you replace the backup battery you'll need to solder it back. The backup battery is what keeps your data if you remove the main battery. I don't remember how long the backup battery will keep your data.
If you do the search here, I think you'll find instruction on how to replace the backup battery.
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