Since the upgrade my C2-phone to SailfishOS 5.0.0.76 last week, I also experienced some unusual battery drains in the morning:
When picking up the device for the first time after waking up, in -at least two times the last 5 days- it would suddenly sound a ‘low-battery” alarm.
First time I left it unplugged the when going to bed because it indicated the power level was higher than some 80%. The morning after the low-power alarm went off and it indicated a battery level of 8%. When plugging the power cord in, it also seemed to be siugnificanly warmer than the ambient temperature, but after a couple of hours the battery was recharged completely again.
Yesterday night I also left it unplugged with the battery at around 100%.
When I picked it up the first time this morning, it beeped loudly and shut down, showing a battery level of 2%.
Did not notice a higher temperature this time (but probably some power safe mechanism already killed any energy intensive process before it dropped down to 2%)
Since the phone powered off, I don’t have the logs before the last boot.
User: defaultuser
Encryption: (Also) enabled for both built-in system-flash and removable micro SD-card.
<Content of /home/defaultuser/.cache/harbour-batterybuddy-daemon.log>
[09:51:01] harbour-batterybuddy-daemon 4.3.2-1
[09:51:01] Using /home/defaultuser/.config/harbour-batterybuddy/harbour-batterybuddy.conf
[09:51:01] Load: highAlert 82
[09:51:01] Load: highNotificationsInterval 13
[09:51:01] Load: lowNotificationsInterval 13
[09:51:01] Load: healthNotificationsInterval 13
[09:51:01] Load: highLimit 80
[09:51:01] Battery charge file: /sys/class/power_supply/battery/capacity
[09:51:01] Charging/discharging current file: /sys/class/power_supply/battery/current_now
[09:51:01] Max charge current file: not found
[09:51:01] Status file: /sys/class/power_supply/battery/status
[09:51:01] Charger status file: not found
[09:51:01] AC status file: not found
[09:51:01] Battery temperature file: /sys/class/power_supply/battery/temp
[09:51:01] Battery health file: /sys/class/power_supply/battery/health
[09:51:01] Charger control file not found!
[09:51:01] Please contact the developer with your device model!
[09:51:01] Battery: 4%
[09:51:01] Battery current inverted
[09:51:01] State: charging
[09:51:01] Temperature: 34°C
[09:51:01] Health: good
[09:51:24] Temperature: 35°C
[09:51:54] Battery: 5%
[09:51:54] Temperature: 34°C
[09:52:24] Temperature: 32°C
[09:52:54] Temperature: 29°C
[09:53:24] Battery: 6%
</Content of /home/defaultuser/.cache/harbour-batterybuddy-daemon.log>