diff --git a/src/msgraph_core/requests/batch_request_item.py b/src/msgraph_core/requests/batch_request_item.py
index d7818736..608da1a9 100644
--- a/src/msgraph_core/requests/batch_request_item.py
+++ b/src/msgraph_core/requests/batch_request_item.py
@@ -258,19 +258,16 @@ def serialize(self, writer: SerializationWriter) -> None:
         writer.write_str_value('method', self.method)
         writer.write_str_value('url', self.url)
         writer.write_collection_of_primitive_values('depends_on', self._depends_on)
-        writer.write_collection_of_object_values(
-            'headers',
-            self._headers  # type: ignore # need method to serialize dicts
+        writer.write_additional_data_value(
+            {'headers': self._headers} # need proper method to serialize dicts
         )
         if self._body:
             json_object = json.loads(self._body)
             is_json_string = json_object and isinstance(json_object, dict)
             # /$batch API expects JSON object or base 64 encoded value for the body
             if is_json_string:
-                writer.write_collection_of_object_values(   # type: ignore
-                    # need method to serialize dicts
-                    'body',
-                    json_object
+                writer.write_additional_data_value(
+                    {'body': json_object} # need proper method to serialize dicts
                 )
             else:
                 writer.write_str_value('body', base64.b64encode(self._body).decode('utf-8'))
diff --git a/tests/requests/test_batch_request_item.py b/tests/requests/test_batch_request_item.py
index 1f3dd971..77639360 100644
--- a/tests/requests/test_batch_request_item.py
+++ b/tests/requests/test_batch_request_item.py
@@ -1,7 +1,10 @@
 import pytest
+import json
 from io import BytesIO
+from unittest.mock import Mock
 from urllib.request import Request
 from kiota_abstractions.request_information import RequestInformation
+from kiota_abstractions.serialization.serialization_writer import SerializationWriter
 from kiota_abstractions.method import Method
 from kiota_abstractions.headers_collection import HeadersCollection as RequestHeaders
 from msgraph_core.requests.batch_request_item import BatchRequestItem
@@ -15,7 +18,7 @@ def request_info():
     request_info.http_method = "GET"
     request_info.url = "f{base_url}/me"
     request_info.headers = RequestHeaders()
-    request_info.content = BytesIO(b'{"key": "value"}')
+    request_info.content = b'{"key": "value"}'
     return request_info
 
 
@@ -27,7 +30,7 @@ def batch_request_item(request_info):
 def test_initialization(batch_request_item, request_info):
     assert batch_request_item.method == "GET"
     assert batch_request_item.url == "f{base_url}/me"
-    assert batch_request_item.body.read() == b'{"key": "value"}'
+    assert batch_request_item.body == b'{"key": "value"}'
 
 
 def test_create_with_urllib_request():
@@ -123,3 +126,11 @@ def test_batch_request_item_method_enum():
 def test_depends_on_property(batch_request_item):
     batch_request_item.set_depends_on(["request1", "request2"])
     assert batch_request_item.depends_on == ["request1", "request2"]
+
+
+def test_serialize(batch_request_item):
+    writer = Mock(spec=SerializationWriter)
+    batch_request_item.serialize(writer)
+    writer.write_additional_data_value.assert_any_call({'headers': batch_request_item._headers})
+    json_object = json.loads(batch_request_item._body)
+    writer.write_additional_data_value.assert_called_with({'body': json_object})