Compaq Evo N180 Maintenance And Service Manual page 97

2. Use a flat-bladed tool to press the RTC battery socket release
tab 1 to the right (Figure 5-18). The RTC battery is released
from its socket.
3. Remove the RTC battery 2.
Make sure the "+" sign is facing up when installing the RTC
battery.
Figure 5-18. Removing the Disk Cell RTC Battery
Reverse the above procedure to install the RTC battery.
Maintenance and Service Guide
Removal and Replacement Procedures
5–25