There are some battery draining tricks you can do with Bluetooth apps on a phone to drain the device batteries.
Essentially if you did a ton of device queries to every BLE device visible, you could drain the batteries of every device in range. Transmission is probably a heavier battery drain so just making them talk to your phone creates drain.
It’s a single device example, but in a bar once I was showing a co-worker once how you could see and interrogate a lot of BLE devices. I pinged someone’s Fitbit, and read that it only had 3% battery left. Then it vanished. I’m pretty sure in the process of asking it to give me the info, it drained the battery.
Essentially if you did a ton of device queries to every BLE device visible, you could drain the batteries of every device in range. Transmission is probably a heavier battery drain so just making them talk to your phone creates drain.
It’s a single device example, but in a bar once I was showing a co-worker once how you could see and interrogate a lot of BLE devices. I pinged someone’s Fitbit, and read that it only had 3% battery left. Then it vanished. I’m pretty sure in the process of asking it to give me the info, it drained the battery.