Phoscon Hive no Battery Status

I have 4 Phoscon Hive Battery lights on my Zigbee ZHA network.

Hive Overview (phoscon.de)

While I can control the lights without any issues and the devices are running the latest firmware, the battery status does not display.

However, I can read the battery status using the Cluster command and get a correct value from 0 to 200 for battery_percentage_remaining (id: 0x0021).
Interestingly, the lights are showing as main-powered instead of battery-powered.

Does anyone have any ideas on how to solve this issue?

Device Signature:

{
  "node_descriptor": "NodeDescriptor(logical_type=<LogicalType.EndDevice: 2>, complex_descriptor_available=0, user_descriptor_available=0, reserved=0, aps_flags=0, frequency_band=<FrequencyBand.Freq2400MHz: 8>, mac_capability_flags=<MACCapabilityFlags.MainsPowered|RxOnWhenIdle|AllocateAddress: 140>, manufacturer_code=4405, maximum_buffer_size=82, maximum_incoming_transfer_size=82, server_mask=11264, maximum_outgoing_transfer_size=82, descriptor_capability_field=<DescriptorCapability.NONE: 0>, *allocate_address=True, *is_alternate_pan_coordinator=False, *is_coordinator=False, *is_end_device=True, *is_full_function_device=False, *is_mains_powered=True, *is_receiver_on_when_idle=True, *is_router=False, *is_security_capable=False)",
  "endpoints": {
    "1": {
      "profile_id": "0x0104",
      "device_type": "0x010d",
      "input_clusters": [
        "0x0000",
        "0x0001",
        "0x0003",
        "0x0004",
        "0x0005",
        "0x0006",
        "0x0008",
        "0x0300"
      ],
      "output_clusters": [
        "0x0019"
      ]
    },
    "242": {
      "profile_id": "0xa1e0",
      "device_type": "0x0061",
      "input_clusters": [],
      "output_clusters": [
        "0x0021"
      ]
    }
  },
  "manufacturer": "Phoscon",
  "model": "Hive",
  "class": "zigpy.device.Device"
}