Introduction
Follow this guide to replace the battery of your Nikon Coolpix P90 camera with a fully charged EN-EL5 rechargeable Li-ion battery. It provides 3.7V and 1100mAh. Check your battery to ensure you are replacing with a compatible model.
Make sure that your camera is off and unplugged from the charger before you begin this repair.
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            Use your finger to push the latch of the compartment door to the center of the camera body, per image 1. 
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            Push the door open, and remove the existing battery with your fingers, per images 2-3. 
 
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                            Conclusion
                          
                          To reassemble your device, follow these instructions in reverse order.