Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Battery can NOT be changed

I just learned from Motorola that if the battery in your HS850 Bluetooth dies in one year - they will replace the unit free. IF however the battery dies after the year - you just throw the entire unit away. So end result is you lost your purchase price. Bummer. But if and when it dies I will split it open to see how it works and if I can modify it to work.