Canon PowerShot A580 2463B020 User Guide (en)

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Preparations
12
Getting
 Started
To Remove the Batteries
Open the cover and remove the batteries. 
To Remove the Memory Card
Use a finger to push the memory card in until you hear a click, then 
release it.
 
Take care that you do not drop the batteries.
Use the wrist strap to avoid dropping the camera during use.