eForChina
eForChina 5.5 x 2.1 mm to Square USB Power Adapter Gender Changer 13 cm
Converts a square laptop power port to a 5.5 mm by 2.1 mm barrel plug using a 13 cm cable
- Changer TypePower Adapter
- Converts square laptop port to 5.5 x 2.1 mm barrel plug
- 13 cm cable keeps desk tidy without excess slack
- Female square input fits ThinkPad, ThinkBook and Xiaoxin power bricks
- Male 5.5 x 2.1 mm output powers compatible devices directly
- Female 5.5 x 2.5 mm interface adds extra connection option
Laptop power adapter with square input
This adapter cable connects a laptop that uses a square power port to a standard 5.5 mm round barrel plug. The female square input accepts the proprietary connector found on certain ThinkPad, ThinkBook and Xiaoxin models. The male 5.5 mm output fits common 2.1 mm or 2.5 mm barrel jacks. The cable length is about 13 cm.
Replaces proprietary square charger tip
It lets owners of square-port laptops use an existing round-barrel power supply or universal charger instead of the original square-tip brick. The jump is worth it when the original square-tip adapter is lost, damaged or unavailable and a compatible round-tip source is already on hand. No internal voltage conversion is performed; the source must already match the laptop's requirements.
Handles 5.5 mm barrel compatibility
The 13 cm lead comfortably reaches a power brick sitting on a desk while the laptop rests nearby. It runs out when the power source uses a barrel size other than 5.5 mm outer diameter with 2.1 mm or 2.5 mm inner diameter. Buyers who need a different barrel size, a longer cable or a USB-C power input cannot use this adapter.
Highlights
- Converts square laptop port to 5.5 x 2.1 mm barrel plug
- 13 cm cable keeps desk tidy without excess slack
- Female square input fits ThinkPad, ThinkBook and Xiaoxin power bricks
- Male 5.5 x 2.1 mm output powers compatible devices directly
- Female 5.5 x 2.5 mm interface adds extra connection option
Specifications
| Changer Type | Power Adapter |
|---|
Questions about this item
What square-port laptop models does this 13 cm adapter fit?
The female square connector matches ThinkPad, ThinkBook and Xiaoxin power ports, converting them to a 5.5 × 2.1 mm round plug.
Which end plugs in first when installing this gender changer?
Insert the square female end into the laptop power port, then connect the 5.5 × 2.1 mm male tip to your charger; reversing the order leaves the adapter loose.
Will the 5.5 × 2.5 mm female interface on this cable wear out and need replacement?
The 5.5 × 2.5 mm female socket is rated for repeated mating cycles; replace the adapter only if the centre pin becomes loose or the cable sheath frays.
New to this? Which coin should you pay with — what to check, what it costs to pay, and what is never asked for.
Also in this aisle
People compared these
Same shelf, same checkout — eight coins and a 30-minute rate lock.



