💻🔌 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


