LG LG840G - Manual (Page 8)

6 LG 840G | User Guide
Installing the SIM Card and Battery
Remove the battery cover
Hold the phone on your hand firmly. With the other hand, lift the back
cover using the fingertip cutout located at the bottom of the cover and
remove it.
Remove the battery
Hold the top edge of the battery and using your fingernail, lift the battery
from the battery compartment.