The phone doesn't currently alert the user when the battery is critical.
This leads to power loss at times and the user doesn't know it's about to happen or had happened.
e.g. during a call, or while listening to music. Also if the phone is sat on the desk unplugged from power connection.
<https://wiki.ubuntu.com/Power#Warnings>: "When the device’s battery/batteries are discharging and reach — or begin discharging and already have — 1 hour or less remaining (PC) or 20% or less remaining (phone/tablet), a notification bubble should appear ... When the device’s battery/batteries are discharging and reach — or begin discharging and already have — 30 minutes or less remaining (PC) or 10% or less remaining (phone/tablet), an alert should appear..."
Assigning mpt for Design guidance on how to notify the user of low battery situations, such as when and how to notify users.
The spec currently mentions "Be warned of low battery" by "bubble notification, alert" on both the PC and Phone.
On the PC, this role is currently filled by gnome-settings- daemon, which makes bubble notifications with the strings listed in engine_ charge_ critical( ) at <https:/ /git.gnome. org/browse/ gnome-settings- daemon/ tree/plugins/ power/gsd- power-manager. c#n518>