Astrum HP 420/425/620/625 Battery ABT‑HP4321
Brand: Astrum
SKU: ABT‑HP4321
Manufacturer Part Number: ABT‑HP4321
Product Overview
The Astrum ABT‑HP4321 Replacement Battery is engineered for HP and Compaq laptops, including HP 420, 425, 620, 625, and ProBook 4420S/4520S/4525S series.
Operating at 10.8V with a 4400mAh capacity, this internal 6‑cell Li‑Ion battery ensures efficient energy storage, reduced memory effect, and consistent performance for students, professionals, and mobile users.
With advanced safety protections and durable construction, it provides reliable daily use while supporting sustainable practices.
Key Features
4400mAh high‑capacity design for extended unplugged productivity
Optimized compatibility with HP 420/425/620/625, Compaq 320/321/325/326/421/621, and HP ProBook 4420S/4520S/4525S series laptops
Premium 6‑cell Li‑Ion design with no memory effect
Multi‑protection circuit prevents overcharging, overheating, and short circuits
Certified safe: CE and RoHS compliant
Easy installation, no special tools required
Backed by a 12‑month warranty
Technical Specifications
Feature Specification
Voltage 10.8V
Capacity 4400mAh
Chemistry Li‑Ion
Cells 6‑Cell
Compatible Part No 587706‑121, 587706‑131, 587706‑221, 587706‑241, 587706‑251, 587706‑421, 587706‑541, 587706‑741, 587706‑751, 587706‑761, 592909‑221, 592909‑241, 592909‑421, 592909‑721, 592909‑741, 593572‑001, 593573‑001, BQ350AA, BQ350AAABA, BQ350AAAC3, HSTNN‑CB1A, HSTNN‑CB1B, HSTNN‑CBOX, HSTNN‑DB1A, HSTNN‑DB1B, HSTNN‑I85C, HSTNN‑I85C‑3, HSTNN‑I85C‑4, HSTNN‑I85C‑5, HSTNN‑I86C, HSTNN‑I86C‑3, HSTNN‑I86C‑4, HSTNN‑I86C‑5, HSTNN‑IB1A, HSTNN‑LB1A, HSTNN‑Q78C, HSTNN‑Q78C‑3, HSTNN‑Q78C‑4, HSTNN‑Q81C, HSTNN‑Q81C‑3, HSTNN‑Q81C‑4, HSTNN‑UB1A, HSTNN‑W79C‑5, HSTNN‑W80C, HSTNN‑XB1A, HSTNN‑XB1B, PH06, PH06047, PH06047‑CL, PH09, PH09093, PH09093‑CL, ABT‑HP4321
Safety Protections Overcharge, over‑discharge, overheat, short‑circuit
Warranty 12 months
Compatible Model Numbers
HP Series:
HP 420, 425, 620, 625
Compaq Series:
Compaq 320, 321, 325, 326, 420, 421, 425, 621
HP ProBook Series:
ProBook 4420S, 4520S, 4525S
ProBook 4320, 4320s, 4320t, 4321, 4321s, 4325s, 4326s, 4421s, 4425s
Installation & Maintenance Tips
Power Off: Shut down the laptop and disconnect the AC adapter
Remove Old Battery: Unscrew and disconnect the old internal battery
Insert New Battery: Align and secure the Astrum battery in place
Initial Charge: Fully charge before first use for optimal performance
Care Tips: Avoid extreme temperatures; perform full discharge cycles monthly
What’s in the Box
1 × Astrum 10.8V 4400mAh Internal Battery (ABT‑HP4321)
1 × User Manual (with safety guidelines)