The Jabra BT 250V headphone set is a Bluetooth type of telephone ear device. The Jabra BT 250V's battery is similar to those used in cell phones inasmuch as they are rechargeable with an AC wall-plug charger. However, the battery on the Jabra can go bad over time. Before replacing the Jabra battery you will have to order one directly for the specific model from the company.
Unscrew the small screw in the centre of the Jabra's body.
Slide the body to the left until it slips off.
Unclip the existing, old battery.
Clip the replacement battery into place.
Replace the cover and the screw that held it down with the screwdriver.