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Rectangular black Lenovo 300W power adapter with cable

Lenovo

Lenovo 4X21L18243 300W AC Adapter

SKU CH-3SGV-KS4EC MPN 4X21L18243

300W AC adapter powers compatible Lenovo devices as a replacement or spare unit

  • Main functionInternet Tablet
  • Product typeAC Adapters
  • Product weight1 lb (0.45 kg)
  • 300 W output powers demanding Lenovo laptops
  • OS independent design works across supported models
  • 00 lb weight keeps travel bags light
  • Genuine Lenovo part ensures safe charging
  • 4X21L18243 matches original equipment specification

Lenovo 300W AC Adapter

The Lenovo 300W AC Adapter delivers 300 watts of power to compatible Lenovo laptops and tablets. It serves as a direct replacement or spare unit for users who need reliable charging at a desk or on the move. The OS independent design ensures broad compatibility across supported models without driver installation. Weighing 1.00 lbs, it is built for daily transport.

Build integration and portability

This adapter connects to a standard wall outlet and the device’s proprietary charging port, requiring no extra cables or docks. Its single brick form factor frees up bag space compared to carrying multiple lower wattage chargers. The unit supports continuous operation while the system is under full load, removing the need to throttle performance when away from a fixed workstation.

Sustained load behaviour

Under continuous heavy workloads the adapter maintains its rated 300W output without thermal shutdown. Energy efficient circuitry keeps heat generation low during extended charging sessions. The design supports simultaneous operation and battery replenishment so the system stays powered through long rendering or compile tasks.

How it compares

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

Price $189.99
Pricier than about 90% of the 27,790 comparable items (median $30.99).

Specifications

Product
Brand nameLenovo
Model name4 × 21L18243
Part number4 × 21L18243
Product typeAC Adapters
Size & build
Product weight1 lb (0.45 kg)
Shipping weight1.34 kg
Package size384 × 157 × 51 mm
More details
Main functionInternet Tablet

Questions about this item

What is the maximum power output this adapter can sustain continuously?

The adapter is rated at 300 W continuous output for Lenovo devices.

How much heat or fan noise does the 300 W adapter produce during all-day use?

The unit has no fan and runs silently; its metal casing dissipates heat passively.

Which connector must my Lenovo laptop already have to use this adapter?

It uses the standard Lenovo rectangular slim-tip plug found on compatible models.

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