The date/time (back-up) battery maintains the camera's date and time. Its service life is about 5 years. If the date/time is reset when the battery is replaced, replace the back-up battery with a new CR2016 lithium battery as described below.
![](/library/attachments/ServiceWareImages/LDImages/SolutionAnswer/PowerShot G2/gdate_time_batt_1.jpg)
1) Turn off the power and slide the battery cover in the direction of the arrows.
![](/library/attachments/ServiceWareImages/LDImages/SolutionAnswer/PowerShot G2/gdate_time_batt_2.jpg)
2) Push point (1) with your fingertip while pulling the date time battery holder out to remove it.
![](/library/attachments/ServiceWareImages/LDImages/SolutionAnswer/PowerShot G2/gdate_time_batt_3.jpg)
3) Insert a fingernail into the groove in the date time battery and push it out in the direction of the arrow.
![](/library/attachments/ServiceWareImages/LDImages/SolutionAnswer/PowerShot G2/gdate_time_batt_4.jpg)
4) Place a new date battery into the date battery holder with the negative terminal (-) facing upward.
5) Replace the date battery holder, replace the battery pack and close the battery cover.
The date/time setting will also be reset, so be sure to set the correct date/time.
For the date/time battery, be sure to use a CR2016 lithium battery.