DELL 451-BBUN 62WHr 4-Cell laptop battery
- Lithium-Ion
- Notebook
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65 W AC adapter with rectangle USB tip for compatible ThinkPad laptops
This 65 watt AC adapter delivers 20 volts at 3.25 amps through a yellow rectangular USB-style tip. It accepts 100 to 240 volt mains input at 50 to 60 hertz and includes the power cord. The unit is aimed at owners of compatible ThinkPad laptops who need a replacement or spare charger.
The adapter draws up to 1.8 amps from the wall and converts it to 65 watts of regulated DC output. In normal operation it runs silently with no moving parts and produces only modest warmth. No active cooling is required and the enclosure dissipates heat passively.
The charging tip is a rectangular yellow USB-style plug, not a USB-C connector. Buyers must verify that their laptop uses this exact tip shape before purchase. Machines requiring a different connector, higher wattage or USB-C power delivery cannot use this adapter.
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Plug the AC cord into the adapter, then insert the yellow rectangle USB tip firmly into the laptop's power port until it clicks; the step often missed is verifying the tip orientation matches the port before applying force.
The AC power cord and the rectangle USB tip can wear from repeated bending; replace the cord if the insulation frays or the tip if the connector becomes loose or intermittent.
Sustained 65W output causes the adapter body to reach its thermal limit first, triggering internal protection that reduces power until the unit cools down.
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