Dell Latitude E5420 (Early 2011) - Manual (Page 107)

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Coin-Cell Battery
Removing the Coin-Cell Battery
1. Follow the procedures in Before Working On Your Computer .
2. Remove the battery .
3. Remove the subscriber identity module (SIM) card .
4. Remove the secure digital (SD) card .
5. Remove the back panel .
6. Remove the memory.
7. Remove the keyboard trim .
8. Remove the keyboard .
9. Remove the optical drive.
10. Remove the hard drive .
11. Remove the wireless wide area network (WWAN) .
12. Remove the wireless local area network (WLAN) .
13. Remove the CPU door.
14. Remove the heat sink .
15. Remove the processor .
16. Remove the palm rest.
17. Remove the ExpressCard/Smart Card/PCMCIA module ,
18. Remove the display assembly.
19. Remove the LED board.
20. Remove the support brackets .
21. Remove the system board.
22. Disconnect the coin-cell battery connector.
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