Garmin TR-1 - Manual (Page 7)

7
Changing Batteries
When the remote control system starts to respond erratically, the key-
pad remote may need battery replacement.
The wireless remote keypad is powered by a CR-2032 Button Lithi-
um Cell Battery.
To access the battery for replacement, gently pry apart the two halves
of the keypad at the seam (fingernails will do for this) Once the unit
is open, remove the battery by sliding the battery out from beneath the
retainer. Replace with the same type of battery.
Battery
Caution:
The wireless remote keypad is not waterproof. Do not expose the
remote to rain or water spray. Water in the remote will cause it
to malfunction and possibly cause throttle runaway. In the event
the remote does get wet, remove the battery from the remote
immediately. If the remote is subject to salt-water incursion,
remove the battery and gently rinse the disassembled unit with
clean alcohol and let it dry out before re-assembly and reuse.