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Rectangular black AC adapter with detachable power cord

E-buy

E-buy 20V 4.5A 90W AC adapter for Lenovo ThinkPad 45N0237 45N0238

SKU CH-QXEJ-RB29B

90W 20V 4.5A AC adapter with worldwide 100-240V input and over-voltage and over-heat protection for compatible Lenovo ThinkPad models

  • Power adapter voltage20 V
  • Power adapter current4.5A
  • Power adapter wattage90 W
  • Delivers 90W at 20V for reliable ThinkPad charging
  • Worldwide 100-240V input works on any mains supply
  • Over-voltage and over-heat protection guards the laptop
  • Replaces Lenovo part numbers 45N0236 through 45N0239
  • Includes AC adapter and a free power cord

90W 20V ThinkPad Adapter

This 90W AC adapter delivers 20V at 4.5A for compatible Lenovo ThinkPad laptops. It replaces part numbers 45N0237 and 45N0238 among others listed. The unit accepts worldwide AC input from 100V to 240V at 50Hz or 60Hz. A free power cord is included in the package.

Installation and Common Issues

Connect the barrel tip to the laptop and plug the cord into a mains socket. Verify that the output voltage and tip size match the original charger before use. The most frequent problem is a loose or worn DC jack on the laptop side causing intermittent charging. Over-voltage and over-heat protection circuits are built in to guard against power irregularities.

Sustained Load Behaviour

Under continuous 90W draw the adapter maintains stable 20V output thanks to its protection circuitry. Over-heat protection will throttle or shut down the unit if internal temperatures exceed safe limits during prolonged maximum load. The wide input range ensures consistent performance across different regional mains supplies. It is not suited for laptops requiring higher wattage or a different voltage.

How it compares

Measured against everything we stock in Laptop Chargers & Batteries, at today’s prices. Recalculated every night.

Price $19.99
Cheaper than about 72% of the 27,790 comparable items (median $30.99).

Specifications

Power
Power adapter voltage20 V
Power adapter current4.5A
Power adapter wattage90 W

Questions about this item

How can I confirm the 20V 4.5A 90W adapter is charging my ThinkPad correctly?

The laptop should show a charging indicator and the battery level should rise while the adapter is connected to a 100-240V 50-60Hz outlet.

What comes in the package and what must I supply myself?

The box contains one new AC/DC adapter and one free AC power cord; you only need a working wall socket.

Which part number should I match to be sure this 90W charger fits my model?

Match your original charger to any listed compatible number such as 45N0237, 45N0238, 0B46994 or 0B47000.

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