BenQ P51 - Manual (Page 22)

10 Hardware setup
6. Lower the SIM card holder with the
SIM card in it to close it. Push the
SIM card holder in the direction of
the arrow (as shown in the figure to
the right) to lock it.
Battery installation
1. The battery goes into the battery
compartment in the back of the
phone. Slip the battery into the
battery compartment top edge first.
2. With the top half in position, push down the rest of the battery into the
compartment. The battery latch will click to secure the battery in place.