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Short braided cable with 7.9x5.5mm female plug and large square male connector

eForChina

eForChina Power Adapter 7.9x5.5mm to Big Square 100W 30cm

SKU CH-P9NH-F65PH

Connects 7.9x5.5mm power sources to YOGA 3 and first-generation big square tips with a 30 cm braided cable rated for 100 W at up to 20 V

  • Adapter typePower Adapter
  • Delivers up to 100 W power for demanding laptops
  • 30 cm cable keeps workspaces tidy
  • 9 × 5.5 mm female fits legacy barrel ports
  • Converts to big square first-generation male tip
  • Nylon braid resists wear during daily transport

Connector Profile

This adapter converts a 7.9x5.5mm female barrel jack into a YOGA 3 and big square first-generation male plug. It targets users who need to power compatible ThinkPad, ThinkBook or Xiaoxin laptops from an existing barrel-type charger.

Power Delivery Limit

The cable supports USB Power Delivery up to 100W across an 18.5-20V range. It cannot negotiate higher voltages or wattages, so devices demanding more than 100W will not charge at full speed.

Length and Carry Trade-off

At 30cm the braided nylon cable keeps a bag tidy and adds minimal bulk for travel. The short reach means the power brick must sit close to the laptop, which can be awkward on cramped desks or in tight airline seats.

How it compares

Measured against everything we stock in Other Adapters & Couplers, at today’s prices. Recalculated every night.

Price $6.99
Cheaper than about 90% of the 1,761 comparable items (median $18.99).

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Specifications

Product
Adapter typePower Adapter

Questions about this item

Which connector combination do I need — 7.9x5.5 mm female to Yoga 3 male or to Big Square first-generation male?

This adapter provides a 7.9x5.5 mm female socket on one end and a Big Square first-generation male plug on the other, matching ThinkPad and Xiaoxin models that use that barrel size.

What does the 100 W rating mean when I plug this into my laptop?

The cable supports up to 100 W power delivery at 18.5–20 V, so it can charge compatible ThinkPad, ThinkBook or Xiaoxin laptops at their full supported speed.

Does the USB-C PD interface limit the voltage or wattage I actually get?

The USB-C Power Delivery connection negotiates up to 20 V and 100 W, so the practical limit is set by your charger and laptop, not by the adapter itself.

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