Take your finger nail and remove the left side of the D903 cover and you’ll see the battery.
Remove the battery. Inside of the cover you’ll see a stick with a “+” and “-“ sign. Line up the new battery with the sticker and place the cover back on.
Your new Discover D903 battery is installed. Let the headset charge until the 4 LED lights on the charging base are on and you’re ready to use your headset.
If you have old office headsets or conference phones you’d like cash back or credit for, click the image below!