HP 39g+ User Manual page 263

To install the main
batteries
To install the
backup battery
Reference information
a. Slide up the battery compartment cover as illustrated.
b. Insert 3 new AAA batteries into the main compartment.
Make sure each battery is inserted in the indicated
direction.
a. Press down the holder. Push the plate to the shown
direction and lift it.
b. Insert a new CR2032 lithium battery. Make sure its
positive (+) side is facing up.
c. Replace the plate and push it to the original place.
After installing the batteries, press
on.
Warning: When the low battery icon is displayed, you
need to replace the batteries as soon as possible.
However, avoid removing the backup battery and main
batteries at the same time to avoid data lost.
Plate
Holder
to turn the power
R-5