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Your OPD-540 uses 1 CR-2016, 3-volt lithium battery.
To install or replace the battery, follow these steps:
1. Slide the battery compartment out from the OPD-
540.
The battery compartment is located on the right
side of the OPD-540, below the LCD.
2. Remove the old battery, if necessary, and insert the
new one with the positive (+) side facing up.
3. Replace the battery cover.
Warning! If the battery wears out completely, or if you
take more than a few seconds while changing the
battery, any user-entered information will be erased.
You should always keep written copies of your
important information.
Replacing the Battery
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