Sony Ericsson Xperia Mini Pro Working Instructions page 83

Reassembly
Place the Battery Cover onto its proper position as shown
and press to snap the hooks.
Press this side to secure the three hooks snapped.
Press the opposite side to secure the two hooks snapped.
Press the bottom side to secure the two hooks snapped.
1251-8382 Rev 2
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Sony Ericsson Mobile Communications AB – Company Internal
Working Instructions (mech)
83(85)