diff --git a/moto/batch/models.py b/moto/batch/models.py
index cafb5db1c..0af0677b1 100644
--- a/moto/batch/models.py
+++ b/moto/batch/models.py
@@ -1585,22 +1585,34 @@ class BatchBackend(BaseBackend):
         return jobs
 
     def cancel_job(self, job_id, reason):
+        if job_id == "":
+            raise ClientException(
+                "'reason' is a required field (cannot be an empty string)"
+            )
+        if reason == "":
+            raise ClientException(
+                "'jobId' is a required field (cannot be an empty string)"
+            )
+
         job = self.get_job_by_id(job_id)
-        if job.status in ["SUBMITTED", "PENDING", "RUNNABLE"]:
-            job.terminate(reason)
-        # No-Op for jobs that have already started - user has to explicitly terminate those
+        if job is not None:
+            if job.status in ["SUBMITTED", "PENDING", "RUNNABLE"]:
+                job.terminate(reason)
+            # No-Op for jobs that have already started - user has to explicitly terminate those
 
     def terminate_job(self, job_id, reason):
-        if job_id is None:
-            raise ClientException("Job ID does not exist")
-        if reason is None:
-            raise ClientException("Reason does not exist")
+        if job_id == "":
+            raise ClientException(
+                "'reason' is a required field (cannot be a empty string)"
+            )
+        if reason == "":
+            raise ClientException(
+                "'jobId' is a required field (cannot be a empty string)"
+            )
 
         job = self.get_job_by_id(job_id)
-        if job is None:
-            raise ClientException("Job not found")
-
-        job.terminate(reason)
+        if job is not None:
+            job.terminate(reason)
 
     def tag_resource(self, resource_arn, tags):
         tags = self.tagger.convert_dict_to_tags_input(tags or {})
diff --git a/tests/test_batch/test_batch_jobs.py b/tests/test_batch/test_batch_jobs.py
index 95cdda6eb..b6178db38 100644
--- a/tests/test_batch/test_batch_jobs.py
+++ b/tests/test_batch/test_batch_jobs.py
@@ -3,6 +3,7 @@ from . import _get_clients, _setup
 import datetime
 import sure  # noqa # pylint: disable=unused-import
 from moto import mock_batch, mock_iam, mock_ec2, mock_ecs, mock_logs
+import botocore.exceptions
 import pytest
 import time
 from uuid import uuid4
@@ -245,6 +246,33 @@ def test_terminate_job():
     resp["events"][0]["message"].should.equal("start")
 
 
+@mock_batch
+def test_terminate_nonexisting_job():
+    """
+    Test verifies that you get a 200 HTTP status code when terminating a non-existing job.
+    """
+    _, _, _, _, batch_client = _get_clients()
+    resp = batch_client.terminate_job(
+        jobId="nonexisting_job", reason="test_terminate_nonexisting_job"
+    )
+    resp["ResponseMetadata"]["HTTPStatusCode"].should.equal(200)
+
+
+@mock_batch
+def test_terminate_job_empty_argument_strings():
+    """
+    Test verifies that a `ClientException` is raised if `jobId` or `reason` is a empty string when terminating a job.
+    """
+    _, _, _, _, batch_client = _get_clients()
+    with pytest.raises(botocore.exceptions.ClientError) as exc:
+        batch_client.terminate_job(jobId="", reason="not_a_empty_string")
+    assert exc.match("ClientException")
+
+    with pytest.raises(botocore.exceptions.ClientError) as exc:
+        batch_client.terminate_job(jobId="not_a_empty_string", reason="")
+    assert exc.match("ClientException")
+
+
 @mock_logs
 @mock_ec2
 @mock_ecs
@@ -315,6 +343,33 @@ def test_cancel_running_job():
     resp["jobs"][0].shouldnt.have.key("statusReason")
 
 
+@mock_batch
+def test_cancel_nonexisting_job():
+    """
+    Test verifies that you get a 200 HTTP status code when cancelling a non-existing job.
+    """
+    _, _, _, _, batch_client = _get_clients()
+    resp = batch_client.cancel_job(
+        jobId="nonexisting_job", reason="test_cancel_nonexisting_job"
+    )
+    resp["ResponseMetadata"]["HTTPStatusCode"].should.equal(200)
+
+
+@mock_batch
+def test_cancel_job_empty_argument_strings():
+    """
+    Test verifies that a `ClientException` is raised if `jobId` or `reason` is a empty string when cancelling a job.
+    """
+    _, _, _, _, batch_client = _get_clients()
+    with pytest.raises(botocore.exceptions.ClientError) as exc:
+        batch_client.cancel_job(jobId="", reason="not_a_empty_string")
+    assert exc.match("ClientException")
+
+    with pytest.raises(botocore.exceptions.ClientError) as exc:
+        batch_client.cancel_job(jobId="not_a_empty_string", reason="")
+    assert exc.match("ClientException")
+
+
 def _wait_for_job_status(client, job_id, status, seconds_to_wait=30):
     _wait_for_job_statuses(client, job_id, [status], seconds_to_wait)