The i-Myo Pro is a phenomenal device but it has a battery and as with all batteries, they eventually fail.
This is a factory replacement for the battery that was originally installed in your device returning your Pro to cordless greatness.
i- Myo Pro Battery
Batteries as with all batteries will eventually fail. We are happy to supply you with a replacement to allow you to be more mobile, versatile and outright cooler when you can be free of cords :)