BatterySnap by Xhelas

Try it for a week, then requires BatterySnap Xtra.

See at a glance the battery of your phone and of every phone it monitors with BatterySnap:
• battery level on the toolbar icon
• one row per phone: level, charging, temperature, time left, last update
• notifications for low and high levels and when fully charged, with the same thresholds as on the phone

Pairing takes seconds: on the phone, open BatterySnap → Share → Display my share code → A browser on my computer, then type the 6-digit code in the extension. Disconnect at any time from the phone.

The extension talks only to battery-snap.com. No account, no password, no ads, no tracking.