Magellan 310 - Manual (Page 13)

Setting up the Meridian is a simple three-step process: installing the
batteries, selecting the language to be used and initializing the Meridian.
The Magellan Meridian uses two AA batteries that are installed from the
back through the battery cover. You can
expect to get up to 14 hours of usage on two
AA batteries with the backlight turned off.
To remove the battery cover, push the two
buttons on the cover fully to the left and lift
the battery cover away from the receiver.
Insert the new batteries as shown, making
sure that the batteries are installed with the
correct polarity.
Replace the cover and push the two buttons
fully to the right. Verify that the cover is locked in place.
How much time do I have to replace the batteries? Any
waypoints or routes you have created are stored in permanent
memory with the batteries removed. Present position and time data
is not stored in permanent memory but will be held in memory for
at least 12 hours without batteries installed.
Always turn the Meridian off before removing the batteries
or turning off external power. Failure to do so can cause loss
or corruption of data.
Magellan Meridian GPS Receiver 3