diff --git a/pyproject.toml b/pyproject.toml
index 0832620..c2ea0e1 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "meshcore"
-version = "0.3.2"
+version = "0.3.3"
 authors = [
   { name="Florent de Lamotte", email="florent@frizoncorrea.fr" },
 ]
diff --git a/src/meshcore/mclib.py b/src/meshcore/mclib.py
index 9970b35..0b8c619 100644
--- a/src/meshcore/mclib.py
+++ b/src/meshcore/mclib.py
@@ -364,7 +364,7 @@ class MeshCore:
             case 11: # contact
                 self.result.set_result("meshcore://" + data[1:].hex())
             case 12: # battery voltage
-                self.result.set_result(int.from_bytes(data[1:2], byteorder='little'))
+                self.result.set_result(int.from_bytes(data[1:3], byteorder='little'))
             case 13: # device info
                 res = {}
                 res["fw ver"] = data[1]