Voltage input range for original Macbook air 2008/2009

My charger (A1244 | 45w) no longer works. And I need to buy a new charger. Since this is for an old 2008 macbook air, the smart thing to do is buy a charger that will work with new models (that require 85w).

Apple doesn't make this power tolerance specification easily available online. This page is helpful, but doesn't provide the tolerance specification....

Intel-Based Apple notebooks: Identifying the right power adapter and power cord - Apple Support

Question:

I want to make sure that the (minimum) voltage input range for my original macbook air is between 14V and 18.5V.

Does anyone have a definitive answer for this?