Introduction
Use this guide to replace the battery of your Pentax Optio WG-2.
Tools
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            If you look on the bottom of the camera you will see a "bump" and in the center of said bump there is a small tab. Simply move the tab and push away from the camera. 
 
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            Now that the tab is open, look inside to see a label (yellow in picture). Simply line up the signs (+ T - ) with the battery and slide in. To close the lid just push down and slide it the opposite way in step one. 
 
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                            Conclusion
                          
                          To reassemble your device, follow these instructions in reverse order.