LG LGVS870 - Manual (Page 11)

9 The Basics
Step 3. Insert the Battery
Insert the battery, making sure to align the gold contacts. Press down
gently to secure the battery.
Step 4. Replace the Back Cover
Place the cover over the back of the phone, then press down along the
edges to secure the cover.
Step 5. Charge the Phone
Before turning on your phone, charge it fully. Be sure to use the charger
that came with your phone.