eForChina AC Adapter 20V 4.5A 90W 7.9x5.0mm

Universal power adapter for ThinkPad notebooks

This 90 W AC adapter accepts a worldwide input range of 100 to 240 V at 50 to 60 Hz. It delivers a regulated 20 V at 4.5 A through a 7.9 x 5.0 mm tip. The unit is built for ThinkPad models that require this specific connector and voltage combination. It replaces a lost or damaged original charger without modification.

Steady 90 W delivery under continuous use

The adapter maintains its full 90 W rating during prolonged charging sessions rather than only in short bursts. Input current stays within 1.5 to 0.9 A across the supported voltage span. This behaviour keeps the notebook powered and the battery charging simultaneously during typical workloads. Thermal design supports sustained operation at the rated output.

Limits of the fixed 7.9 x 5.0 mm barrel interface

The single output tip fits only devices that accept a 7.9 mm outer diameter and 5.0 mm inner diameter barrel plug at 20 V. Polarity and voltage are not adjustable, so the adapter cannot serve laptops that need a different connector size or a higher or lower voltage. Users must verify their notebook's exact tip specification before purchase.