This is the Genuine Plantronics (not after market) Replacement battery for any of the Plantronics Wireless Headset Systems (Plantronics C052, CO52).  Compatible with these Plantronics wireless models:

• Plantronics CS510 (C052, CO52)
• Plantronics CS520  (C052, CO52)
• Plantronics CS510-XD  (C052-XD, CO52-XD)
• Plantronics CS520-XD  (C052-XD, CO52-XD)
• Plantronics Savi W710 Wireless Headset, Monaural Headset 
• Plantronics Savi W720 Wireless Headset, Binaural Headset 
• Plantronics Savi W710-M Wireless Headset for MOC/Lync 
• Plantronics Savi W720-M Binaural Wireless Headset MOC/Lync
• Plantronics Savi W410 Wireless USB Headset UC Standard
• Plantronics Savi W410-M Wireless USB Headset for MOC/Lync
• Plantronics Savi W420 Binaural Wireless USB Headset UC Standard
• Plantronics Savi W420-M Binaural Wireless USB Headset Lync/MOC

Key Features:

• Up to 13 hours of continuous talk time.
• Lithium Ion (Li-on) 3.7v, 270mAh
• CS510, CS520 system base labeled as C052 or CO52
• Not compatible with older discontinued Plantronics wireless headset models: CS351N, CS361N, Savi WO300 & WO350
• part# 200840-011 is marked on the battery

Old Poly part # 202599-03

New HP part # 85Q97AA

Plantronics CS510/CS520/W710/W720/W410/W420 Battery Replacement Instructions:

1. Use fingernail to lift off and flip open battery door.
2. Use hook end of tool to hook battery wires and pull toward open battery door until battery moves out from behind post.
3. Once battery is removed, gently disconnect battery connector. do not pull hard.
4. Close door so that it is flush with headset.
5. Using the “Y” end of the tool, press the battery backwards and away from battery door until the left corner of the battery tucks under the post in the battery compartment. Tuck all of the battery wires and connectors into the battery compartment.

6. Close door so that it is flush with headset.