diff --git a/src/msgraph_core/requests/batch_request_builder.py b/src/msgraph_core/requests/batch_request_builder.py
index 56f2a3ce..2cd22620 100644
--- a/src/msgraph_core/requests/batch_request_builder.py
+++ b/src/msgraph_core/requests/batch_request_builder.py
@@ -23,7 +23,7 @@ def __init__(self, request_adapter: RequestAdapter):
         if request_adapter is None:
             raise ValueError("request_adapter cannot be Null.")
         self._request_adapter = request_adapter
-        self.url_template = "f{self._request_adapter.base_url}/$batch"
+        self.url_template = "{}/$batch".format(self._request_adapter.base_url)
 
     async def post_content(
         self,
diff --git a/src/msgraph_core/requests/batch_response_item.py b/src/msgraph_core/requests/batch_response_item.py
index 691eae19..91c39881 100644
--- a/src/msgraph_core/requests/batch_response_item.py
+++ b/src/msgraph_core/requests/batch_response_item.py
@@ -146,9 +146,8 @@ def get_field_deserializers(self) -> Dict[str, Any]:
         return {
             "id": lambda x: setattr(self, "id", x.get_str_value()),
             "status": lambda x: setattr(self, "status", x.get_int_value()),
-            "headers":
-            lambda x: setattr(self, "headers", x.get_collection_of_primitive_values(str)),
-            "body": lambda x: setattr(self, "body", x.get_collection_of_primitive_values(str)),
+            "headers": lambda x: setattr(self, "headers", x.try_get_anything(x._json_node)),
+            "body": lambda x: setattr(self, "body", x.get_bytes_value()),
         }
 
     def serialize(self, writer: SerializationWriter) -> None: