Lenovo Thinkpad Helix 36984SU Power Adapter

My Lenovo Thinkpad Helix 36984SU comes with an output 90W, 2.25A, 20V Power Adapter.  I have a spare Power Adapter with an output that is 90W, 4.6A, 19V.  I have a rectangular adapter that I can connect it to the Helix.  Is it safe to use? 
Thanks

Can you post a picture of the adapter head you tried to modify, because these adapter suppose to come with adapter heads that fit all Lenovo laptops.
It would also help the Lenovo to troubleshoot the problem for you and their product.
Modifying your adapter may potentially avoid your warranty.
Regards,
Jin Li
May this year, be the year of 'DO'!
I am a volunteer, and not a paid staff of Lenovo or Microsoft

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