Index: usr.sbin/apm/apm.c
===================================================================
RCS file: /cvs/src/usr.sbin/apm/apm.c,v
retrieving revision 1.41
diff -u -p -u -p -r1.41 apm.c
--- usr.sbin/apm/apm.c	13 Feb 2022 21:27:51 -0000	1.41
+++ usr.sbin/apm/apm.c	10 Sep 2022 08:24:23 -0000
@@ -376,8 +376,15 @@ balony:
 		} else if (domin) {
 			if (reply.batterystate.battery_state ==
 			    APM_BATT_CHARGING)
-				printf(", %d minutes recharge time estimate\n",
-				    reply.batterystate.minutes_left);
+			{
+				if (reply.batterystate.minutes_left ==
+				    (u_int)-1)
+					printf(", unknown");
+				else
+					printf(", %d minutes",
+					    reply.batterystate.minutes_left);
+				printf(" recharge time estimate\n");
+			}
 			else if (reply.batterystate.minutes_left == 0 &&
 			    reply.batterystate.battery_life > 10)
 				printf(", unknown life estimate\n");