diff --git a/sys/dev/acpica/acpi_battery.c b/sys/dev/acpica/acpi_battery.c
--- a/sys/dev/acpica/acpi_battery.c
+++ b/sys/dev/acpica/acpi_battery.c
@@ -266,7 +266,14 @@
      */
     if (valid_units > 0) {
 	if (dev == NULL) {
-	    battinfo->cap = (total_cap * 100) / total_lfcap;
+	    /*
+	     * Avoid division by zero if none of the batteries had valid
+	     * capacity info.
+	     */
+	    if (total_lfcap > 0)
+		battinfo->cap = (total_cap * 100) / total_lfcap;
+	    else
+		battinfo->cap = 0;
 	    battinfo->min = total_min;
 	    battinfo->state = batt_stat;
 	    battinfo->rate = valid_rate;