The battery indicator lights on the K750 are not intended to stay on. This is the normal behavior of the keyboard.
When the keyboard is first turned on, one of the battery indicator lights next to the Check-Light button (shown below) will flash:
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Green light
If it the green LED flashes, this means the battery level is good.
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Red light
If the red LED flashes, it means the battery level is low.
To conserve power, neither battery indicator light will remain lit after the initial signal.
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