We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Black rectangular AC adapter with square USB tip and US three-prong power cord

PISKEKAT

PISKEKAT 90W 20V 4.5A USB square tip AC adapter

SKU CH-6T7F-42NH7

90W 20V 4.5A USB square-tip AC adapter powers compatible Lenovo ThinkPad, IdeaPad, Yoga and Flex laptops and includes a US three-prong power cord

  • Battery typeLaptop Batteries
  • Delivers 90W power for demanding Lenovo laptops
  • 20V 4.5A output matches original charger specifications
  • Square USB tip fits X1 Carbon and Yoga models
  • 100-240V input works worldwide with US cord included
  • Replaces over 30 Lenovo part numbers including 45N0237

90W USB square-tip adapter

This 90W AC adapter delivers 20V at 4.5A through a USB square-tip connector, matching the power requirements of numerous Lenovo ThinkPad and IdeaPad models. It accepts 100-240V input at 50-60Hz, making it suitable for worldwide use with the included US three-prong power cord. The unit replaces a wide range of Lenovo part numbers across 45W, 65W and 90W original adapters.

90W capacity and headroom

At 90W this charger comfortably powers ThinkPad X1 Carbon, T440, X240, E440 and E540 models as well as IdeaPad Yoga, Flex and S-series laptops that originally shipped with 45W or 65W adapters. It will not support systems requiring higher wattage or those using round-barrel or slim-tip connectors instead of the USB square tip.

Included power cord

The package supplies a detachable US three-prong AC cord, allowing immediate connection to North American mains outlets without a separate purchase. No additional cables, tips or software are bundled, so users needing alternative plug types or connector styles must source them separately.

How it compares

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

Price $25.99
Cheaper than about 60% of the 27,790 comparable items (median $30.99).

Specifications

Power
Battery typeLaptop Batteries

Questions about this item

Will the 20V 4.5A square-tip output work with my older ThinkPad X240 that used a 65W adapter?

Yes — the adapter delivers 20V 4.5A (90W) through the USB square tip, and the compatibility list includes the X240 alongside 45W and 65W part numbers such as ADLX65NCC2A and ADLX45NCC3A.

How can I confirm the charger is operating correctly once connected?

The laptop should show a charging indicator and report 20V input in its power settings; the adapter accepts 100–240V 50–60Hz AC and supplies a steady 20V 4.5A DC output.

What cables are included and is there anything else I need to buy?

The box contains the AC adapter with fixed USB square-tip cable and a detachable 3-prong US power cord; no extra cables are required for the listed Lenovo models.

More in Laptop Chargers & Batteries

Similar items