This item has been discontinued. Please see this replacement battery instead.

https://www.startechtel.com/products/dantona-replacement-battery-for-cs50-danbatt-cs50

Key Features:

• Mfr. Part #: 64399-01
• Battery (65358-01) for CS Series (Note: Battery has part 65358-01 printed on it, but Plantronics tags the bag with part 64399-01)
• For use with the following Headsets: Plantronics CS50, CS55/CS55H, CS50-USB & Avaya AWH-55/AWH-55+

Replacement Instructions:

1. Remove earloops or headbands from the Plantronics CS50 or CS55 headset.
2. Find the two sets of grooves on the the sides of the headset. Squeeze both & pull outward to remove the battery door.
3. Under the battery door, you will see a rectangular battery attached to the headset with two white plastic connectors. Slide these connectors apart to detach the battery.
4. Reattach the two white plastic connectors. Then reassemble the headset, add any earloops or headbands & charge for 2 hours before use.