Introduction
If the device isn't powering on, then the issue may be due to the battery. Follow these steps to replace the battery.
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Turn over the device so that the bottom is facing up. Make sure the hinged side is facing you.
 
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Move the right switch towards the right until it clicks in place. You should then see the color red reveal from where the switch was originally.
 
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                            Conclusion
                          
                          To reassemble your device, follow these instructions in reverse order.