The battery on my Polytune Clip is already dead, is it possible to power the Polytune Clip with a power supply?
It is not possible to power the Polytune Clip with a power supply, we physically couldn't mount a power connector on the unit to accommodate this.
That being said, the device should be able to work for about a year on the battery that is supplied in the device. If you find yourself going through batteries quickly, you should contact support for an alternate solution.
If the battery is about a year old, it may just be time to replace it with a fresh CR2032 battery. You can access it from the small door clip on the back of the unit.