Remove The Rtc Battery - Lenovo 300e Hardware Maintenance Manual

Figure 16. Detach the connector
Step 2. Remove 2 screws. Then release the speaker cable from the cable guides.
Figure 17. Remove 2 screws
Screw specifications
M2.0 x 3
Step 3. Remove the speakers.
Figure 18. Remove the speakers

Remove the RTC battery

Make sure the following FRUs (or CRUs) have been removed.
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Lenovo 300e 2nd Gen Hardware Maintenance Manual
Number of screws
2