Kyocera 2100 Series Reference Manual page 23

Your phone comes with an internal/removable lithium ion (LiIon) battery. The battery
is partially charged when you receive the phone.
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To install a new battery, do the following.
NK Hold the phone face down.
Place the battery with the metal contacts facing
down and toward the bottom of the phone.
Align the battery door to the grooves on the side of
the phone.
OK Slide the battery door on while pressing down firmly,
ensuring that the battery door clicks into place.
Check and repeat if the battery door is not aligned.
Do not force.
PK Connect the AC Adapter to the proper jack on the bottom of
the phone, then connect the adapter's plug to a wall outlet.
Fully charge the battery before using the phone.
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