AC Adapter Lenovo 45W Slim Tip FRU45N0503 — replacement power supply for ThinkPad laptops

The Lenovo AC Adapter 45W Slim Tip is a replacement power supply designed for compatible ThinkPad laptops. It provides 45 watts of DC power through a slim-tip connector to restore battery charging and supply continuous power during use. The adapter is intended for everyday home and office use, for travel, or as a spare unit in environments where a compact, easily swappable charger is needed.

Advantages

The adapter delivers a stable 45W output that supports charging and operation of compatible ThinkPad models while maintaining compact dimensions and low weight for portability. Its slim tip connector matches Lenovo Slim Tip power inlets, enabling a direct, tool-free swap with original chargers. The unit includes integrated protection against common electrical faults, providing regulated output under normal mains conditions.

Suitable for

• Daily charging and power for compatible ThinkPad laptops
• Portable use during travel or remote work
• Replacement or spare charger in home, office, or education settings

Key specifications

• Output power: 45 watts
• Connector type: slim tip DC plug compatible with Lenovo Slim Tip inlet
• Input: AC mains voltage range for standard regional use
• Regulated DC output suitable for laptop charging and operation
• Compact, lightweight enclosure for improved portability

How to use

Connect the adapter to a compatible mains socket using the attached power cord or regional mains lead. Insert the slim tip connector into the laptop power inlet until it seats firmly. When connected, the adapter supplies power and initiates battery charging according to the laptop’s charging logic. Disconnect the adapter by gently withdrawing the slim tip from the laptop and unplugging the mains lead if the charger will not be used for an extended period.

Recommendations

Use the adapter only with laptops that accept a 45W slim tip input. Operate the adapter in dry, well-ventilated locations and avoid obstructing ventilation around the adapter housing. If the adapter becomes hot to the touch, allow it to cool and verify the laptop charging behavior; discontinue use if abnormal heat, smell, or smoke occurs. For optimal battery health, follow manufacturer guidance on charging cycles and avoid prolonged connection when not required.