Apeks Quantum Owner's Manual page 50

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Note: It is recommended that you do not handle the new battery with bare fingers,
as skin oils may impair the electrical contact. Handle the battery with a lint-free
cloth or wear gloves.
6. The Quantum uses a CR2032 3v lithium
coin cell battery. The new battery is
installed with positive (+) side facing
upward. Insert the battery at a slight
angle so the edge pushes against the gold
contact, then press the battery into place.
7. Lightly lubricate a new O-ring using a food-grade silicone grease, such as Dow
Corning 111. This grease is available at most dive shops. Do not overlubricate.
Install the new O-ring onto the battery hatch. Carefully thread the battery
hatch into the case in a clockwise direction until snug. Using a coin, tighten the
battery hatch until it can no longer be turned.
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