⚠️ IMPORTANT BUYING NOTICE:

• PH06 Extended Capacity Layout Blueprint: This professional-grade 10.80V Lithium-Ion (Li-ion) replacement battery features a high-capacity 9-cell stick-profile housing measuring exactly 268.50 x 43.05 x 42.20 mm and weighing 589.00 g. Because it utilizes an expanded cell matrix to achieve a massive 7800 mAh configuration, this battery pack is thicker than standard 6-cell versions. It will protrude slightly from the bottom or rear of your notebook, acting as a natural ergonomic typing tilt and boosting cooling airflow underneath the chassis without obstructing any functional ports. It slides smoothly into the rear external docking tracks and locks into place with dual spring-loaded chassis slider toggles.

• Model Platform & Cross-Brand Compatibility (Crucial Rule): This custom power module is engineered to bridge a major multi-brand ecosystem from the 2010–2011 eras, covering the classic HP ProBook 4320s, 4420s, and 4520s series, the HP 420/620 budget lines, and an extensive array of Compaq 320, 420, and 620 models. Please note that it will not fit later generation ProBook models (such as the ProBook 4330s, 4430s, or 4530s, which rely on the PR06 battery profile), nor will it fit modern slim internal laptops. Before placing your checkout order, slide your notebook's battery locking switches open, release your old battery pack, and verify that its casing explicitly displays core tracking markers like PH06, BQ350AA, HSTNN-CB1A, HSTNN-DB1A, or 587706-751.
  
  

⚡ MAXIMUM EXTENDED RUNTIME & CORE SYSTEM PERFORMANCE RESTORATION: Unleash ultimate wireless freedom and long-lasting mobile endurance for your daily workstation or office fleet laptop with this brand-new, premium replacement external battery engine. Packed with premium Samsung cells and optimized for a stable 10.80V layout, this high-performance module delivers a massive capacity rating of 7800 mAh (84.00 Wh)—nearly doubling the runtime of a standard factory battery. It effortlessly handles multi-tasking workflows, web browsing, spreadsheet database tasks, and legacy enterprise software applications. It serves as an immediate, drop-in remedy to correct common age-related hardware degradation symptoms, including rapid percentage drops, sudden application performance throttling under high processing bursts, or an immediate system blackout whenever you disconnect your factory AC power adapter. Outfitted with an on-board smart protection chipset array, it continuously safeguards your consumer hardware setup from over-charge, over-discharge, unexpected short circuits, and localized internal heat shifts.

Compatible Original Part Numbers: PH06, PH06047, PH06093-CL, 587706-751, 587706-761, 593572-001, 593573-001, BQ350AA, BQ350AA#ABA, HSTNN-CB1A, HSTNN-C72C, HSTNN-DB1A, HSTNN-IB1A, HSTNN-LB1A, HSTNN-UB1A, HSTNN-Q78C, HSTNN-Q78C-3, HSTNN-Q78C-4, HSTNN-Q81C, HSTNN-W79C-5, TPN-Q74

Comprehensive Laptop Compatibility List:

HP ProBook Mainstream Business Series

• HP ProBook 4320s Fleet: 4320s, 4320s (WP446PA), 4321s, 4325s, 4326s, 4320t Thin Client

• HP ProBook 4420s Fleet: 4420s, 4421s, 4425s Series

• HP ProBook 4520s Fleet: 4520s, 4520s (WK524EA), 4520s (XT943UT), 4525s Series
  
  

HP & Compaq Essentials Budget Series

• HP Mobile Processor Fleet: HP 420, HP 425, HP 620, HP 625 Notebook PC

• Compaq 300 Architecture Fleet: Compaq 320, Compaq 321, Compaq 325, Compaq 326

• Compaq 400 & 600 Fleet: Compaq 420, Compaq 421, Compaq 620, Compaq 621 Notebook PC
  
  

Disclaimer: The batteries and other products supplied by our Company are [replacement for] sold for use with certain products of computer manufacturers, and any reference to products or trademarks of such companies is purely for the purpose of identifying the computers with which our products [are replacement for] may be used. Our Company and this Website are neither affiliated with, authorized by, licensed by, distributors for, nor related in any way to these computer manufacturers, nor are the products offered for sale through our Website manufactured by or sold with the authorization of the manufacturers with which our products [are replacement for] may be used