Nokia Lumia 810 - Manual (Page 11)

2. On the bottom edge of the phone, put your fingernail in the micro-USB connector opening, and
pull on the cover until it is loose. Remove the back cover.
3. If the battery is in, lift it out.
4. Push the memory card into the memory card slot until it locks into place.
5. Line up the battery contacts, and carefully replace the battery.
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