diff --git a/server/nightr/util.py b/server/nightr/util.py
index 82725a1..5985465 100644
--- a/server/nightr/util.py
+++ b/server/nightr/util.py
@@ -1,4 +1,5 @@
 import base64
+import random
 from dataclasses import dataclass, field
 from pathlib import Path
 from typing import List, Dict
@@ -9,7 +10,7 @@ import numpy as np
 
 @dataclass
 class Context:
-    battery: int = 55
+    battery: int = field(default_factory=lambda: random.randint(0, 100))
     position: Dict[str, float] = field(default_factory=lambda: {'latitude': 53.0, 'longitude': 9.0})  # Denmark somewhere
     image: np.ndarray = None