diff --git a/models.py b/models.py
index fa32646..4cd8cb6 100644
--- a/models.py
+++ b/models.py
@@ -35,7 +35,7 @@ class Battery(Base):
     __tablename__ = "battery"
 
     id = Column(Integer, primary_key=True, autoincrement=True)
-    label = Column(String(50), nullable=False)
+    label = Column(String(50), nullable=False, unique=True)
     brand = Column(String(100), nullable=False)
     status = Column(String(20), nullable=False, default="available")
     device_id = Column(Integer, ForeignKey("device.id", ondelete="SET NULL"), nullable=True)