diff --git a/homeassistant/components/sonos/speaker.py b/homeassistant/components/sonos/speaker.py
index 055b4ce6845..dc610cee38a 100644
--- a/homeassistant/components/sonos/speaker.py
+++ b/homeassistant/components/sonos/speaker.py
@@ -382,6 +382,14 @@ class SonosSpeaker:
         """Update device properties from an event."""
         if more_info := event.variables.get("more_info"):
             battery_dict = dict(x.split(":") for x in more_info.split(","))
+            if "BattChg" not in battery_dict:
+                _LOGGER.debug(
+                    "Unknown device properties update for %s (%s), please report an issue: '%s'",
+                    self.zone_name,
+                    self.model_name,
+                    more_info,
+                )
+                return
             await self.async_update_battery_info(battery_dict)
         self.async_write_entity_states()
 
diff --git a/tests/components/sonos/test_sensor.py b/tests/components/sonos/test_sensor.py
index 12c12821a0d..8d402b589b0 100644
--- a/tests/components/sonos/test_sensor.py
+++ b/tests/components/sonos/test_sensor.py
@@ -83,3 +83,23 @@ async def test_battery_on_S1(hass, config_entry, config, soco, battery_event):
     power_state = hass.states.get(power.entity_id)
     assert power_state.state == STATE_OFF
     assert power_state.attributes.get(ATTR_BATTERY_POWER_SOURCE) == "BATTERY"
+
+
+async def test_device_payload_without_battery(
+    hass, config_entry, config, soco, battery_event, caplog
+):
+    """Test device properties event update without battery info."""
+    soco.get_battery_info.return_value = None
+
+    await setup_platform(hass, config_entry, config)
+
+    subscription = soco.deviceProperties.subscribe.return_value
+    sub_callback = subscription.callback
+
+    bad_payload = "BadKey:BadValue"
+    battery_event.variables["more_info"] = bad_payload
+
+    sub_callback(battery_event)
+    await hass.async_block_till_done()
+
+    assert bad_payload in caplog.text