[Elecraft] Battery Charger Voltage High?

[RLVZ at aol.com]

Hi Guys,
 
I'm operating from a portable location and using a 12-volt  automobile 
battery with my K3.  To keep the battery charged I'm using a  Schumacher 15-Amp 
Charger/Maintainer that automatically switches to "Trickle  Charge" when the 
battery is charged.  My concern is that when the charger  is connected the 
battery voltage is peaking at 16.0 volts.  The K3 manual says "maximum 
voltage is 15  volts".
 
Do I need to be concerned about powering the K3 with 16.0  volts?
 
Thanks,
 
Dick- K9OM