If a new battery is installed improperly, it might damage the device. Ensure that the battery is oriented correctly in its socket before removing it, and only replace it with batteries of the same type. Dispose used battery properly as per local regulations.
Without touching the system board, pull the battery out of its socket using a plastic pry tool. Ensure you place the plastic pry tool between the battery and the socket when attempting to remove the battery from the socket. Otherwise, the system board might be damaged by prying off the socket or by breaking circuit traces on the system board. To avoid damage to the battery connector, firmly support the connector while removing the battery.
For information about how to remove and then replace the CMOS (coin-cell) battery in your Dell laptop, see the documentation for your computer, and then search for CMOS battery or coin-cell battery, and follow the instructions.
See the Dell Knowledge Base article Manuals and Documentation for your Dell Product, for information about how to obtain and view the documentation for your Dell device. In addition to the procedures found in your product Manual/User Guide we have knowledge articles on How to Replace a CMOS Battery on Your Dell Desktop and Customer Self-Replaceable Parts
These should be used for reference only in addition to your specific product instructions.