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This is the Poly CA22CD-SC, CA22CD-DC Wireless Headset System Replacement/Spare Battery Pack.

Key Features:

• Up to 10 hours of continuous talk time.
• Charge one battery while remaining hands-free and mobile with another
• Genuine Poly battery

Old Poly part # 218401-01

New HP part # 8K6Q8AA#AC3

*Important Note on Returns: Due to the manufactures policy, this is a special order item.  All Sales are FINAL.  It's not returnable, not refundable under any circumstance.  If it's defective, Plantronics/Poly will replace it for you under warranty