Did you connect directly to them via Bluetooth or is this based on what it’s reporting via WiFi through the Hub?
If it’s only through the hub there is a known issue with this but directly via Bluetooth should update the battery percentage correctly.
If you have a Hub, what is the MAC Address for it? I’ll see if there’s a newer version of firmware for it.
We’re working on a new firmware for the Hub that will report battery levels correctly, we will begin testing it in the next couple of weeks.