Compaq 6720s Battery Replacement Guide (HSTNN-IB51/IB52)

The market for Compaq 6720s replacement batteries (part numbers HSTNN-IB51, HSTNN-IB52) remains steady, driven by the enduring use of legacy HP business notebooks in secondary markets and cost-conscious professional environments.

Product Insights & Specifications

The Compaq 6720s typically uses a 6-cell Lithium-ion battery. Modern replacements have slightly improved capacities compared to the original OEM parts:

Capacity Range: Options range from standard 4400 mAh (48 Wh) to high-capacity 5200 mAh (58 Wh) variants Laptopbatteryexpress Westenditstore.
Voltage: Primarily 10.8 V, though often listed as compatible with 11.1 V systems Amazon Laptopbatteryexpress.
Runtime Performance: Original batteries provided ~2.5 hours of WiFi surfing Notebookcheck. Modern 5200 mAh replacements can achieve 2–3 hours of active use depending on power settings Laptopbatteryexpress Laptopbatteryexpress.

Market Trends & Pricing

The global laptop battery market is projected to grow at a CAGR of 5.5% through 2026, reaching a valuation of $9.3 billion Alibaba Persistencemarketresearch. For the Compaq 6720s niche:

Retail Pricing: Replacement batteries generally retail between $45.00 and $79.00 on specialist platforms Westenditstore Laptopbatteryexpress.
Wholesale/B2B Market: Bulk sourcing from manufacturers (primarily in Dongguan and Shenzhen, China) offers significant cost advantages, with unit prices dropping to $5.49–$9.92 for orders of 10+ units Alibaba Alibaba.
Compatibility Trends: There is a high degree of cross-compatibility; these batteries often fit multiple legacy models including the Compaq 510, 550, 610, and 6730s series Batterymart Flickr.