Charger for Lenovo ThinkPad T420 4178-57U 20V 4.5A 90W Specifications
Adapter Type: Lenovo ThinkPad AC Power Adapter
Laptop Model: Lenovo ThinkPad T420 4178-57U
Output Voltage: 20V DC
Output Current: 4.5A
Output Power: 90W
Input Voltage: 100–240V AC
Input Frequency: 50–60Hz
Connector Type: Lenovo Round Barrel Connector
Included Accessories: AC Power Cord
Compatibility: Lenovo ThinkPad T420 series laptops
Adapter Design: High-quality replacement power supply for business laptops
Warranty: The warranty tendered hereunder, on the electronic product(s) sold under this invoice will be provided exclusively by their respective Authorized Agents/Distributors and are limited to the period indicated from the date ofyour invoice, except otherwise mentioned as per the warranty conditions as carried along with the products(s)
Charger for Lenovo ThinkPad T420 4178-57U 20V 4.5A 90W Overview
The Charger for Lenovo ThinkPad T420 4178-57U 20V 4.5A 90W AC Adapter Power Supply is a dependable replacement charger designed for Lenovo ThinkPad T420 laptops. It provides 20V DC output at 4.5A, delivering 90W power to keep your laptop running efficiently while charging the battery.
This adapter is ideal for replacing damaged, lost, or faulty chargers while maintaining reliable performance for business tasks, office applications, internet browsing, programming, and everyday productivity.
The compact Lenovo AC adapter design makes it suitable for home, office, and travel use. Its universal 100–240V AC input allows operation across different electrical systems. Lenovo 90W ThinkPad adapters support worldwide voltage input and include an AC power cord.
Not compatible with older round connector systems.
USB-C Power Delivery
Used on modern USB-C charging laptops.
Not supported by ThinkPad T420.
Charger for Lenovo ThinkPad T420 4178-57U 20V 4.5A 90W FAQs
1. Is this charger compatible with Lenovo ThinkPad T420 4178-57U?
Yes. It is designed for Lenovo ThinkPad T420 models requiring a 20V 4.5A 90W adapter.
2. What is the output specification?
The charger provides 20V output at 4.5A, delivering 90W power.
3. Does it include a power cord?
Yes. The adapter includes an AC power cord for connecting to wall outlets.
4. Can I use a 65W charger instead?
A 65W charger may power the laptop in some situations, but the recommended specification is the 90W adapter for reliable performance.
5. Does it support worldwide voltage?
Yes. It supports 100–240V AC input with 50/60Hz frequency.
6. Is it suitable for office and daily use?
Yes. The 90W output provides dependable power for business applications and everyday computing.
Charger for Lenovo ThinkPad T420 4178-57U 20V 4.5A 90W Conclusion
The Charger for Lenovo ThinkPad T420 4178-57U 20V 4.5A 90W AC Adapter Power Supply is a reliable replacement charger for Lenovo ThinkPad T420 users. With 20V output, 4.5A current, 90W power delivery, compatible connector design, and universal voltage support, it provides safe and efficient charging for business, office, and everyday laptop use.
