TREE.NB 16V 4.5A (72W) AC Adapter for ThinkPad

TREE.NB 16V 4.5A (72W) AC adapter — a direct-replacement charger engineered to power a wide range of legacy IBM ThinkPad and Panasonic ToughBook laptops with a standard 5.5mm x 2.5mm DC plug.

This compact replacement adapter delivers DC 16V at 4.5A (72W) from an AC 110–240V input, matching the original specifications used by many older IBM ThinkPad and ToughBook systems. It’s built to be a drop-in substitute for numerous OEM part numbers and model lines, offering a reliable power source when original chargers are lost, damaged or no longer hold a charge.

Which laptop models will this adapter work with?

This adapter is compatible with many IBM ThinkPad series and selected Panasonic ToughBooks. Check your laptop’s voltage and plug size before purchase to ensure fit and safety.

• Supported ThinkPad models: T20/T21/T22/T23/T30/T40/T41/T42/T42P/T43/T50E/R50/R52 and related X and A-series variants.
• Also supports IBM i-series legacy notebooks and Panasonic ToughBook CF-Y, CF-50, CF-51, CF-30, CF-18, CF-34 variants.
• Replaces OEM part numbers such as 02K6545, 02K6548, 83H6739, 11J8959 and others listed by manufacturers.
• DC barrel size: 5.5mm outer / 2.5mm inner — verify your laptop's connector matches this size.

How do I know this charger will safely power my ThinkPad?

The adapter is rated at the same output voltage and adequate current as many original units, and it accepts wide-range AC input for international use. As with any replacement power supply, verify polarity and connector dimensions before connecting.

• Output: DC 16V at 4.5A (72W) — matches the listed IBM specifications.
• Input: AC 110–240V — usable worldwide with the correct mains lead or plug adapter.
• Connector: 5.5mm outer / 2.5mm inner barrel — standard for the covered models.
• Polarity: center positive (standard for these ThinkPad models) — confirm on your original adapter or laptop label.

What are the physical and build details I should expect?

The unit is a compact wall-style AC adapter with a permanently attached DC cable and a standard barrel connector. It’s produced by TREE.NB to be OEM-compatible, designed for everyday use and stable power delivery to legacy laptops.

• Compact rectangular brick housing with indicator LED for power status.
• Fixed-length DC cord terminating in a 5.5 x 2.5mm barrel plug for immediate connection.
• Durable casing and strain relief at cable joints to reduce wear from repeated use.
• Comes as a brand-new replacement unit backed by TREE.NB customer support.

What do I get with purchase and how is support handled?

You receive the TREE.NB replacement AC adapter and the confidence of manufacturer-backed support. TREE.NB provides 24/7 email support and stands behind product quality based on years of manufacturing experience.

• Included: TREE.NB 16V 4.5A AC adapter with attached DC cable (mains cord may vary by region).
• Support: 24x7 email assistance for compatibility or troubleshooting questions.
• Quality assurance: manufactured replacement claimed as OEM-compatible and new.
• Note: Always inspect packaging and adapter labels to confirm voltage and part numbers before use.

Who is this for: This TREE.NB adapter is intended for owners of older IBM ThinkPad, i-series, X-series, A-series and compatible Panasonic ToughBook models who need a direct-replacement AC power supply. It’s ideal for professionals and hobbyists maintaining legacy hardware, second-hand laptop buyers, IT departments supporting mixed-generation fleets, or anyone who requires a reliable, spec-matched charger with easy plug-and-play compatibility. If your device uses a different barrel size, voltage, or polarity, choose a model that matches those specifications rather than this unit.