This app _tries_ to point out battery stage of the bluetooth devices. Bluetooth application MUST has Hands-Free profile (catch, reject phone calls) or GATT profile (assuredly 4.0+ Low Energy devices).
To recheck battery stage merely tap on the notification.
Tried to repair crushes on O+ androids. OMG, I so detest android env: Carrier, IntentService, JobIntentService, JobScheduler, WorkManger and nothing works neatly.
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