Garmin GPS 75 - Manual (Page 71)

C-11
To replace the alkaline batteries...
· Grip the battery pack around the outside edge (not the bottom).
· Push the top of the battery pack against the edge of a hard surface
which will not mar the plastic. The outer sleeve will slide off the
cage, revealing the batteries inside.
· Replace the batteries, observing the polarity diagram engraved in
the plastic.
· Slide the sleeve over the cage until it snaps into place, taking care
that you do not tear the gaskets which seal the battery pack.
C.6 MAINTENANCE
The GPS 75 is constructed of high quality material and should not
require user maintenance. Please refer any repairs to an authorized
GARMIN service center. (The unit contains no user serviceable parts,
do not attempt repairs yourself.)
Never allow gasoline or solvents to come into contact with your unit.
Damage to the case may occur which is not covered by your warranty.
The waypoints, routes, custom settings, and other data stored in the GPS
75 are maintained by an internal battery. (This data will not be lost even
if you remove the AA or rechargeable battery pack for separate storage.)