diff --git a/ecoscope/io/async_earthranger.py b/ecoscope/io/async_earthranger.py
index ecf1b901..21e56681 100644
--- a/ecoscope/io/async_earthranger.py
+++ b/ecoscope/io/async_earthranger.py
@@ -17,7 +17,7 @@
 
 
 class AsyncEarthRangerIO(AsyncERClient):
-    def __init__(self, sub_page_size=4000, tcp_limit=5, **kwargs):
+    def __init__(self, sub_page_size=4000, tcp_limit=5, existing_session=None, **kwargs):
         if "server" in kwargs:
             server = kwargs.pop("server")
             kwargs["service_root"] = f"{server}/api/v1.0"
@@ -30,6 +30,9 @@ def __init__(self, sub_page_size=4000, tcp_limit=5, **kwargs):
         kwargs["client_id"] = kwargs.get("client_id", "das_web_client")
         super().__init__(**kwargs)
 
+        if existing_session is not None:
+            self.auth = existing_session
+
     async def get_sources(
         self,
         manufacturer_id=None,
diff --git a/tests/test_asyncearthranger_io.py b/tests/test_asyncearthranger_io.py
index 8eafb57d..5fb8782a 100644
--- a/tests/test_asyncearthranger_io.py
+++ b/tests/test_asyncearthranger_io.py
@@ -251,3 +251,14 @@ async def test_display_map(er_io_async):
         await er_io_async.get_event_type_display_name(event_type="shot_rep", event_property="shotrep_timeofshot")
         == "Time when shot was heard"
     )
+
+
+@pytest.mark.asyncio
+async def test_existing_session(er_io_async):
+    await er_io_async.login()
+    new_client = ecoscope.io.AsyncEarthRangerIO(
+        service_root=er_io_async.service_root, token_url=er_io_async.token_url, existing_session=er_io_async.auth
+    )
+
+    patrols = await new_client.get_patrols_dataframe()
+    assert not patrols.empty