How to know system uptime under battery ?
so that i can get exact time of battery backup
the uptime shows complete uptime (AC/Battery)
NOTE : I am using linux Mint 17.
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What exactly you mean by "uptime under battery"? Time since last A/C unplug?– peterphOct 18, 2014 at 19:57
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I have the same question. Yes, time since last A/C unplug would help.– Henrique de SousaMar 5, 2021 at 17:06
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1 Answer
You can use UDEV to get the particulars about your system's battery.
connected to power$ upower -i /org/freedesktop/UPower/devices/battery_BAT0
native-path: /sys/devices/LNXSYSTM:00/device:00/PNP0A08:00/device:0a/PNP0C09:00/PNP0C0A:00/power_supply/BAT0
vendor: Panasonic
model: 42T4801
serial: 624
power supply: yes
updated: Sat Oct 18 13:17:16 2014 (2 seconds ago)
has history: yes
has statistics: yes
battery
present: yes
rechargeable: yes
state: fully-charged
energy: 80.5788 Wh
energy-empty: 0 Wh
energy-full: 80.9892 Wh
energy-full-design: 84.24 Wh
energy-rate: 0.00372912 W
voltage: 12.224 V
percentage: 99.4933%
capacity: 96.141%
technology: lithium-ion
$ upower -i /org/freedesktop/UPower/devices/battery_BAT0
native-path: /sys/devices/LNXSYSTM:00/device:00/PNP0A08:00/device:0a/PNP0C09:00/PNP0C0A:00/power_supply/BAT0
vendor: Panasonic
model: 42T4801
serial: 624
power supply: yes
updated: Sat Oct 18 13:37:36 2014 (22 seconds ago)
has history: yes
has statistics: yes
battery
present: yes
rechargeable: yes
state: discharging
energy: 79.9524 Wh
energy-empty: 0 Wh
energy-full: 80.9892 Wh
energy-full-design: 84.24 Wh
energy-rate: 17.172 W
voltage: 11.94 V
time to empty: 4.7 hours
percentage: 98.7198%
capacity: 96.141%
technology: lithium-ion
History (charge):
1413653856 98.720 discharging
1413653826 98.893 discharging
1413653796 99.080 discharging
1413653766 99.293 discharging
History (rate):
1413653856 17.172 discharging
1413653826 17.399 discharging
1413653796 17.453 discharging
1413653766 17.345 discharging
I've never seen anything that shows the time that's elapsed on battery, so you'll have to calculate it from the above output. Also this output will typically show a "time to charge" which is a rough indicator of how long it was on power.
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