Texas Instruments TI-89 Titanium Short User Manual page 50

Replacing the backup (silver oxide) battery
1. To replace the silver oxide backup battery, remove the battery cover
and unscrew the tiny screw holding the BACK UP BATTERY cover in
place.
2. Remove the old battery and install a new SR44SW or 303 battery,
positive (+) side up. Replace the cover and the screw.
Important OS download information
New batteries should be installed before beginning an OS download.
When in OS download mode, the APD feature does not function. If you
leave your calculator in download mode for an extended time before you
actually start the download, your batteries may become depleted. You
will then need to replace the depleted batteries with new batteries
before downloading.
You can also transfer the OS to another TI-89 Titanium using a USB
unit-to-unit cable . If you accidentally interrupt the transfer before it is
complete, you will need to reinstall the OS via a computer. Again,
remember to install new batteries before downloading.
Please contact Texas Instruments as described in Service & Support
Information, if you experience a problem.
Battery Precautions
Take these precautions when replacing batteries:
• Do not leave batteries within the reach of children.
44 Getting Started