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Black rectangular adapter with 5.5 x 2.5mm male plug and large square USB female port, PC plus metal body, about 51x18x11mm, 11g

eForChina

eForChina 5.5 x 2.5mm Male to Big Square USB Female Power Adapter (Black)

SKU CH-Y79D-N7GSP

Converts a 5.5 x 2.5 mm barrel plug to the large square laptop connector in a compact 51 x 18 x 11 mm PC-and-metal housing weighing 11 g

  • Changer TypePower Adapter
  • Converts 5.5 x 2.5mm barrel to big square USB female for laptop charging
  • Pocket-sized at 51 x 18 x 11 mm fits any bag or pocket
  • Weighs only 11 g so it adds virtually no load when travelling
  • Durable PC plus metal housing resists daily wear and tear
  • Simple plug-and-play design needs no drivers or extra cables

What this adapter does

This eForChina power adapter converts a 5.5 x 2.5mm male barrel plug into a big square female connector for compatible laptops. It suits owners of ThinkPad, ThinkBook or Xiaoxin devices who need to use an existing barrel-type power source. Buyers whose laptops require a different tip shape or voltage should look elsewhere.

Thermals noise and power

The passive design has no fan, so it runs silently and adds no active cooling requirement. Power draw depends entirely on the connected supply and laptop; the adapter itself introduces no measurable overhead. No thermal ratings or efficiency figures are supplied by the manufacturer.

Build and daily use

The housing uses PC plastic combined with metal contacts and measures about 51x18x11mm with a weight of about 11g. Its compact form factor makes it easy to carry in a laptop bag or pocket. The fixed big square female socket means you cannot swap tips for other laptop brands without a separate adapter.

Highlights

  • Converts 5.5 x 2.5mm barrel to big square USB female for laptop charging
  • Pocket-sized at 51 x 18 x 11 mm fits any bag or pocket
  • Weighs only 11 g so it adds virtually no load when travelling
  • Durable PC plus metal housing resists daily wear and tear
  • Simple plug-and-play design needs no drivers or extra cables

Specifications

Changer TypePower Adapter

Questions about this item

How do I connect the 5.5 x 2.5mm male plug to my power brick and the big square female port to my laptop?

Insert the 5.5 x 2.5mm male end into the charger's output jack until it seats fully, then plug the big square female end into the laptop's power input; the step often missed is verifying the centre pin polarity matches the laptop before powering on.

Will the PC and metal housing or the 11g connector need any servicing or replacement over time?

The adapter has no moving parts or consumable components; the PC and metal shell is passive, so under normal use it requires no maintenance and only needs replacement if the housing cracks or the pins bend.

At what point does the 51x18x11mm adapter become the limiting factor during continuous charging?

The limiting factor is the current rating of the 5.5 x 2.5mm barrel interface; sustained loads above the charger's rated output will cause voltage drop or overheating at the connector before the adapter itself fails.

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