7.4mm to 4.5mm DC Power Adapter Cable for HP & Dell Laptops

7.4mm to 4.5mm DC Power Adapter Cable — HP & Dell Compatible

Need to connect an older round-tip power supply to a newer slim-tip laptop port? This compact DC power converter cable makes it easy. Designed to convert a 7.4mm × 5.0mm round jack (old type) to a 4.5mm × 3.0mm plug end (new type), it's an affordable, plug-and-play solution for HP and Dell laptop users upgrading their charging setup.

⚠️ Important Notes:

• This cable is intended for same-brand transfers only — HP power supply to HP laptop, or Dell power supply to Dell laptop.
• Cross-brand use (e.g. HP charger with Dell laptop) is not supported.
• When used with a Dell laptop, this adapter will power the device on but will not charge the battery — this is a known Dell firmware limitation.

Key Features

• ✅ Converts 7.4mm × 5.0mm round connector to 4.5mm × 3.0mm slim blue-tip plug
• ✅ Compatible with select HP and Dell laptops
• ✅ Lightweight at approximately 16g
• ✅ Black cable with distinctive blue tip for easy identification
• ✅ 100% brand new and quality-tested
• ✅ Great replacement or backup adapter cable

Specifications

What's in the Box?

• 1 × DC Power Adapter Cable (7.4mm to 4.5mm)

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For more information on electrical connector safety standards, visit the U.S. Consumer Product Safety Commission (CPSC).

Learn more: AC adapter

Frequently Asked Questions

Q: Can I use this DC adapter cable to connect an HP charger to a Dell laptop?

A: No. This cable is designed for same-brand use only — HP power supply to HP laptop, or Dell power supply to Dell laptop. Cross-brand connections are not supported and will not function correctly.

Q: Will this cable charge my Dell laptop battery?

A: When used with a Dell laptop, this adapter can power the laptop on, but due to Dell's firmware restrictions, it will not charge the battery. It functions as a power-only connection in this case.

Q: What connector sizes does this cable convert?

A: This cable converts a 7.4mm × 5.0mm round DC jack (older HP/Dell charger style) to a 4.5mm × 3.0mm slim blue-tip plug (newer HP/Dell laptop port style).

Q: Is this cable compatible with all HP and Dell laptop models?

A: This cable is compatible with HP and Dell laptop models that use the 7.4mm round input and 4.5mm blue-tip output connectors. Please verify your laptop's port size and your charger's connector size before purchasing to ensure compatibility.