[Elecraft] Highest power supply voltage for K2?

[Tom Althoff]

I see old messages about undercharging the K2's internal battery if you don't use more than 14VDC for the PS.    I had a nice 15VDC 20W wall wart that I thought would make a perfect PS/charger for the K2.   The trouble is while drawing 350ma in receive the K2 shows a supply voltage of 17.2 VDC.   I turned off the K2 immediately and turned to the Elecraft group for advice.

What is the absolute highest safe voltage you can pump into the K2 before you start overheating the regulators etc?    Could I squeek by with 17.2 VDC without worrying about letting the smoke out of any of the internal componants?

Tom K2TA