Cisco CP-BATT-8821 Standard Battery — Reliable Power for Your 8821 Wireless IP Phone

Keep your Cisco 8821 Wireless IP Phone powered throughout the workday with this OEM-compatible standard battery. The CP-BATT-8821 delivers extended talk time and dependable standby performance for shift workers, office staff, and mobile teams in demanding enterprise environments.

Key Specifications

• Battery Chemistry: Rechargeable Lithium-Ion (Li-Ion)
• Voltage: 4.35V
• Capacity: 2060mAh (nominal)
• Talk Time: Up to 11.5–13 hours on a full charge
• Standby Time: Up to 240 hours
• Quick Charge: ~3 hours via power adapter or desktop charger
• Weight: 1.3 oz (37 g) — lightweight and compact
• Part Number: CP-BATT-8821 / CP-BATT-8821=

Why Buy from Reef Telecom?

• Industry-leading 10-year warranty on all equipment
• Free shipping on orders over $300
• Trusted B2B telecom equipment supplier
• Fast, reliable fulfillment

Compatibility

This battery is designed exclusively for the Cisco Wireless IP Phone 8821 (CP-8821-K9). It features tool-free installation — simply remove the back cover, swap the battery, and replace the cover. Ideal for healthcare facilities, warehouses, retail floors, and any environment where reliable wireless communication is essential.

Free ground shipping on orders over $300. Same-day shipping on orders placed before 4PM EST.

All products include our industry-leading 10 Year Warranty backed by Reef Telecom.