Lifescan ONE TOUCH BASIC BLOOD GLUCOSE MONITORING SYSTEM Owner's Booklet page 68

When
battry
appears on the display, the Meter
will no longer give results and you
must replace the battery before you
can perform another test.
A dead battery or battery removal
will not affect the previous test
result stored in the Meter's memory,
as long as the battery is replaced
within 30 days.
Replacing the battery
Make sure the Meter is turned off
before you remove the battery.
Turn the Meter upside down.
With your thumb, firmly press in
and up on the ridges on the side
of the battery door until the door
releases from the clasp. Remove
the battery door by sliding it out.
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