I have a Ti, so this is not an issue for me yet. However, I Can tell you what I know from reading these forums for a long time.
They say the battery lasts 4 years, but from what I remember they really last like 8 or 10 usually. I believe you have to solder the new battery on.
To back up your songs you have to do a midi sysex dump, I think you can do it with a free program like MIDI OX? (if I am wrong someone please chime in)
You will need a MIDI interface for your computer, but you can get a cheap midi-usb interface for $50.
hope this helps!
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