diff --git a/src/Controller/CAPI/RiderAppController.php b/src/Controller/CAPI/RiderAppController.php
index 3bd5e4e8..e23d2350 100644
--- a/src/Controller/CAPI/RiderAppController.php
+++ b/src/Controller/CAPI/RiderAppController.php
@@ -833,9 +833,10 @@ class RiderAppController extends ApiController
         $serial = $req->request->get('serial', '');
         if ($jo->getServiceType() == ServiceType::BATTERY_REPLACEMENT_NEW)
         {
+            /*
             if (empty($serial))
-                // TODO: serial is required but disabling for now so old rider app works
-                //return new APIResponse(false, 'Missing parameter(s): serial');
+                return new APIResponse(false, 'Missing parameter(s): serial');
+            */
         }
 
         // set invoice to paid