3
3. Battery Installation
Because of their small size, we recommend that you
insert or remove batteries on a table, desk, or some
other safe place to reduce the risk of dropping the
instrument or battery.
STEP 1
Using your fingernail, gently pull up on the battery door tab
A
until the door swings open. Do not over-extend the battery
door as damage will occur.
STEP 2
Note: The rounded edge of the battery
B
is negative, and
the completely flat side is positive. The flat side (+) needs
to be on the door’s (+) side.
With the red (+) of the battery door facing you
C
, hold the battery with the rounded
edge positioned towards the back, gently push the battery straight in. The lower part
of the battery door will flex to accept the battery.
STEP 3
With the battery installed, gently close the
battery door. Wait for three seconds while
the device powers on. To turn the device
off and to prevent battery drain when not in
use, gently pull the battery door open.
STEP 4
To remove the battery: With the battery red door (+) facing you, tilt the bottom of the
battery towards you. This will allow the battery to move from under the front lip.
Please dispose of used batteries in an environmentally friendly way. Do not place
batteries in your mouth. If swallowed, contact your physician immediately or call the
National Battery Hotline at 1-202-625-3333.
Round edge:
negative (-)
Flat edge:
positive (+)
A
B
C
TETRA Tip: When closing the battery door, it should go into the device VERY
easily. If you must push hard or feel resistance, do not force it. The battery is
likely placed incorrectly in the door. Resist the urge to force it!
