Lifescan OneTouch Owner's Booklet page 52

To replace the batteries, make sure that the meter is
turned off. Turn the meter over and locate the battery
compartment.
1. Press down with both thumbs on each
side of the battery cover's imprinted
arrow. Then slide the battery cover away
in the direction of the arrow.
2. Remove the old batteries. If necessary,
turn the meter over and tap it gently
against the palm of your hand until the
batteries fall out. Insert two 1.5 V (#357
or equivalent) silver oxide batteries,
making sure the positive "+" side of
each battery is facing up in the meter.
3. Place the three tabs of the battery cover
into the three slots in the meter. Move
the battery cover upward in the direction
of the imprinted arrow until the cover
drops into place and you hear a click.
Slide the battery cover down into place
until it clicks.
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