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Black rectangular AC adapter with 5.5 mm barrel connector and detachable power cord

E-buy

E-buy AC adapter 20V 2A 40W 5.5 mm 2.5 mm Lenovo IdeaPad S9e ADP-40NH B

SKU CH-8C2E-X2CM7

A 40 W laptop charger delivering 20 V at 2 A with a 5.5 mm by 2.5 mm barrel connector and an included power cord

  • Power adapter voltage20A
  • Power adapter current4A
  • Delivers 40 W output for reliable laptop charging
  • 20 V / 2 A DC matches Lenovo IdeaPad S9e requirements
  • 5 mm × 2.5 mm connector ensures secure fit
  • 100–240 V 50–60 Hz input works worldwide
  • 24-month coverage included for peace of mind

Direct replacement for Lenovo IdeaPad S9e

This 40 W AC adapter supplies 20 V at 2 A through a 5.5 mm by 2.5 mm barrel connector. It matches the original ADP-40NH B specification and includes a region-appropriate power cord. The unit is intended for owners of compatible Lenovo IdeaPad S9e models who need a new charger.

Replaces a lost or faulty original charger

The adapter restores full charging capability when the factory-supplied unit is missing, damaged or no longer delivers reliable power. Swapping to this unit is worth it whenever the laptop fails to charge or the original connector shows wear. No internal modification is required.

Maintains rated output during continuous use

Designed for 100 to 240 V input at 50 to 60 Hz, the adapter delivers steady 20 V DC under sustained load without dropping voltage. The 24-month warranty period reflects the manufacturer's confidence in long-term reliability. Thermal performance remains consistent across extended charging sessions.

How it compares

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

Price $14.99
Cheaper than about 83% of the 27,790 comparable items (median $30.99).

Specifications

Power
Power adapter voltage20A
Power adapter current4A

Questions about this item

What size barrel connector does this adapter use for the Lenovo IdeaPad S9e?

The DC output uses a 5.5 mm outer diameter and 2.5 mm inner diameter barrel connector.

How do I connect the AC adapter to mains power and the laptop correctly?

Plug the supplied country-specific power cord into the adapter's AC inlet, then into a 100-240 V 50-60 Hz wall socket, and insert the 5.5 mm x 2.5 mm DC plug firmly into the laptop.

When should I consider replacing this 40 W adapter?

Replace it if the output no longer delivers 20 V at 2 A, the cable or connector shows damage, or the unit becomes excessively hot during normal use.

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