Battery data from disconnected device continue to come

Hi,

We are connecting to Brainbit device and subscribing to battery data; after that battery data are coming with 5-second period (as expected).

Then we are disconnecting the device (just removing the battery), but the battery data are continuing to come with the same period (5 seconds).

Is it expected behavior, and we need to manually unsubscribe from battery data when device goes to disconnected state?

C#, Windows 10 1903, SDK version: 1.4.5, Device firmware version: 5