Lenovo ThinkPad 90W Slim AC/DCCombo Adapter User Manual page 22

Types of programmable output voltage and output power tips
1. Tip 1 (P/N: 41R4285)
When Tip 1 is used, the output voltage of the power adapter is 16VDC and
the maximum continuous output power of this product is 72W.
2. Tip 2 (P/N: 41R4286)
When Tip 2 is used, the output voltage of the power adapter is 20VDC and
the maximum continuous output power of this product is 90W.
Special notice of interchangeable voltage tips
1. Please shut off the power adapter before you install, uninstall, or swap the
voltage tips.
2. Do not use the interchangeable voltage tips if oxidation or corrosion is
found in the pins.
Storage of interchangeable voltage tips
Please preserve the voltage tips carefully if you don't use it. Place in a dry
environment.
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ThinkPad and Lenovo 90W Slim AC/DC Combo Adapter: User's Guide