diff --git a/controller/packagesrc/client.py b/controller/packagesrc/client.py
index 6799629..d6dd3b7 100644
--- a/controller/packagesrc/client.py
+++ b/controller/packagesrc/client.py
@@ -254,6 +254,9 @@ class Commander:
         """
         return self._do('robotic_gripper status ?')
 
+    def robot_battery(self) -> int:
+        return self._do('robot battery ?')
+
     def get_ip(self) -> str:
         """
         返回机甲IP。