Opticon PHL 5300 Quickstart Guide - Manual (Page 9)

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4. Follow the instructions on the Pocket PC to lock the main battery lock.
If you need to take out the battery, please unlock the main battery lock and
then pull in the direction of the arrow shown.
y Replacing Battery
1. If cell phone or GPRS connecting fuction has been turned on, you should
turn them off first before going on the next step. Otherwise, the connection
will be interrupted abnormally.
2. Unlock the main battery lock located on the back of this device and take
out the battery.
3. Replace main battery and lock the main battery lock. When the main
battery is taken out, system operation’s power will be supplied temporarily
by back-up battery. However, if you do not install the main battery back
within 1 minute, data will be lost.