diff --git a/src/Controller/CAPI/BatteryController.php b/src/Controller/CAPI/BatteryController.php
index 02ce3104..22064a9d 100644
--- a/src/Controller/CAPI/BatteryController.php
+++ b/src/Controller/CAPI/BatteryController.php
@@ -37,6 +37,7 @@ class BatteryController extends APIController
                 'id' => $batt->getID(),
                 'size' => $batt->getSize()->getID(),
                 'brand' => $batt->getBrand()->getID(),
+                'date_update' => $batt->getDateUpdate()->format('YmdHis'),
             ];
         }