I fellow responded helpfully by e-mail saying the KPA is good to 11.5 V. Alas, I've lost the e-mail! Thanks to the responder! Chris NQ8Z -- View this message in context: http://elecraft.365791.n2.nabble.com/K2-KPA-Low-Batt-warning-and-beep-tp7610871p7610877.html Sent from the Elecraft mailing list archive at Nabble.com.