diff --git a/monitoring/ups-quarterly-test.sh b/monitoring/ups-quarterly-test.sh
new file mode 100755
index 0000000..38b1aed
--- /dev/null
+++ b/monitoring/ups-quarterly-test.sh
@@ -0,0 +1,29 @@
+#!/bin/bash
+# Quarterly UPS battery self-test — runs via cron first Sunday of Jan/Apr/Jul/Oct
+NUT_PASS='Sparky$100'
+NUT_USER='upsadmin'
+NUT_HOST='localhost'
+
+logger -t ups-quarterly-test 'starting quarterly battery self-test'
+
+logger -t ups-quarterly-test 'testing cyberpower1 (Tower)'
+upscmd -u "$NUT_USER" -p "$NUT_PASS" cyberpower1@$NUT_HOST test.battery.start.quick 2>&1 |   logger -t ups-quarterly-test
+
+sleep 120
+
+result1=$(upsc cyberpower1@$NUT_HOST ups.test.result 2>/dev/null)
+logger -t ups-quarterly-test "cyberpower1 result: $result1"
+
+logger -t ups-quarterly-test 'testing cyberpower2 (Rackmount)'
+upscmd -u "$NUT_USER" -p "$NUT_PASS" cyberpower2@$NUT_HOST test.battery.start.quick 2>&1 |   logger -t ups-quarterly-test
+
+sleep 120
+
+result2=$(upsc cyberpower2@$NUT_HOST ups.test.result 2>/dev/null)
+logger -t ups-quarterly-test "cyberpower2 result: $result2"
+
+if [[ "$result1" == 'Done and passed' && "$result2" == 'Done and passed' ]]; then
+    logger -t ups-quarterly-test 'PASS: both UPS batteries healthy'
+else
+    logger -t ups-quarterly-test 'FAIL: one or more UPS batteries need attention'
+fi