💻🔌 Compaq 18.5V 4.5A Power Adapter
 
(18.5V DC • 4.5A • 83W • 4‑Pin Square Connector)

This adapter delivers 18.5V of regulated DC power at 4.5A (83W). It uses a 4‑pin square connector with a keyed layout, designed for Compaq’s Armada series laptops.
 
🔧 Charger Form
Input: 100–240V AC, 50/60Hz
Output: 18.5V DC @ 4.5A (83W)
Connector: 4‑pin square Compaq plug, keyed layout
Common part numbers: 401095‑001, 401882‑001
OEM spec: Mid‑wattage adapter for Compaq Armada notebooks
 
🖥️ Compatible Devices
🟦 Compaq Armada Series
Armada 1500C
Armada 1700
Armada 1750
Armada 7400
Armada 7800
Armada 4100
Armada 4200
Armada 7300
Armada M300 (select revisions)
 
✅ Common Uses
🔌 Powering Compaq Armada notebooks in the 1500–7800 series
🧩 Replacing lost or damaged OEM 401095‑001 adapters
🧪 Supporting legacy laptop restoration and archival setups
🧵 Essential entry for Compaq’s pre‑HP merger power ecosystem
 
🧠 Signal Format
⚡ Input: Universal AC (100–240V)
🔋 Output: Regulated 18.5V DC, 4.5A
🔌 Connector: 4‑pin square Compaq plug
🔁 Not interchangeable with HP/Compaq’s later barrel‑style adapters
 
⚠️ Things to Watch Out For
📉 Must be 18.5V — 19.5V adapters may damage older Armada systems
🔌 Connector is 4‑pin square — not compatible with barrel jacks
🧯 Always confirm “DC IN 18.5V” and connector shape before substitution
📏 Some Armada docking stations used different power specs — verify before use
 
🛠️ Quick Tips for Beginners
🔌 Confirm connector: 4‑pin square, keyed layout
🧪 If laptop won’t power on, inspect pins for corrosion or misalignment
🧯 Label clearly to avoid mix‑ups with HP/Compaq’s later 18.5V barrel adapters
🧵 Keep this entry in your Compaq legacy power catalog