The supply voltage is normal if, when you press the buttons on the remote control, the LED indicator flashes briefly.
The voltage is below normal if, when you press the buttons on the remote control, the LED indicator lights up with two short flashes or does not light up at all.
You will need a flat-head and Phillips-head screwdriver.
1. Unscrew the screw securing the remote control housing cover…
2. …detach the cover from the housing…
3. …and, overcoming the resistance of the retainer, remove the power element.
4. Install a new battery and reassemble the remote control in the reverse order of removal. When installing the element, pay attention to the polarity of the element connection.