diff --git a/check_nut.py b/check_nut.py
index 00fe2bf..db2248a 100644
--- a/check_nut.py
+++ b/check_nut.py
@@ -46,7 +46,7 @@ VALUE_COMPARISONS = {
 }
 VALUE_UNITS = {
     'load': '%',
-    'battery_charge': 'V',
+    'battery_charge': '%',
     'battery_runtime': 's',
     'battery_voltage': 'V',
     'input_voltage': 'V',