Power supply BLOW for notebooks Lenovo 4287# — 20 V 3.25 A 65 W (plug 11×4.5 mm)

AC adapter BLOW 4287# is a replacement power supply designed to deliver regulated 20 V at 3.25 A (65 W) for compatible Lenovo notebooks. The adapter provides a steady DC output through a cylindrical plug with a 11 × 4.5 mm connector, enabling charging and operation of laptops that require this voltage and current. Its compact form factor and single-voltage output make it suitable as a spare or replacement unit for home, office, or travel use.

Advantages

The adapter offers a stable 20 V / 3.25 A output that supports normal laptop operation and battery charging without overvoltage. Its 11 × 4.5 mm cylindrical plug matches the power inlet of many Lenovo models that accept this connector size. The unit is lightweight and compact for easy transport, and includes built-in regulation and basic protection against short circuits and overcurrent to maintain safe operation under typical use conditions.

Suitable for

• Replacing a lost or damaged Lenovo notebook charger that requires 20 V, 3.25 A input
• Keeping as a spare charger for travel or remote work
• Powering compatible laptops during stationary use where continuous mains power is needed

Key specifications

• Output voltage: 20 V DC
• Output current: 3.25 A
• Maximum power: 65 W
• Connector type: cylindrical DC plug, 11 × 4.5 mm
• Input: mains AC (typical for notebook adapters)
• Form factor: external AC adapter (brick-style) with detachable or fixed mains lead depending on configuration

How to use

Connect the adapter to mains power using the supplied or compatible mains lead, then insert the 11 × 4.5 mm DC plug into the laptop power inlet until it seats firmly. Ensure the laptop is switched off or in a safe state during initial connection. Check that the laptop indicates charging or accepts external power. Disconnect by removing the DC plug from the laptop and then unplugging the mains lead when power is no longer required.

Usage recommendations

Use this adapter only with laptops that explicitly accept a 20 V DC input and the 11 × 4.5 mm plug. Avoid using with devices that require different voltage, polarity, or connector dimensions. Keep the adapter in a ventilated area during operation, avoid exposure to water or extreme temperatures, and inspect cables and connectors periodically for damage.