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I would like to know (1) if it is safe and (2) will it work to charge two old non-USB-C laptops using a USB-C charger.

My laptops:

  1. Acer Aspire A515-54, which power supply provides output of 19V and 2.37A.
  2. HP ProBook 445 G7, which power supply provides output of 19.5V and 2.31A.

My USB-C charger is a Lenovo, Max 65W, with outputs: 20V,3.25A / 15V,3A / 9V,2A / 5V,2A (Model is ADLX65YLC3A)

I found online many USB-C to round-tip adapters on different sizes and shapes (e.g. Here which claims to output 19V with 4.74A), but I have no clue if it will safely charge the laptop (with no battery explosion or power supply damage etc).

Also, if I understand correctly, USB-C charging protocol starts with a handshake between the charger and device, to determine the correct power spec, so given that the laptops are non USB-C compatible (so no handshake happens), would power transfer even happen? Or is such adapters do the handshake themselves?

Thank you!

Israel
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    the charging protocol handshake should be happening between the power supply and the round-tip adapter ... not between the power supply and the laptop PC – jsotola Sep 27 '22 at 15:17

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