Get current battery level
License: MIT License
Get current battery level
$ npm install battery-level
const batteryLevel = require('battery-level');
(async () => {
console.log(await batteryLevel());
//=> 0.55
})();Returns a Promise<number> with the battery level.
I'm trying to use your module as dependencies on an electron app. The code i run is very simple and the promise resolve a NaN value.
The os is Windows 10.
when using the cli on lenovo laptop, it gives the following error
Cannot read property 'length' of undefined
on this file
battery-level/index.js:24
res = res.percentage.slice(0, res.percentage.length);
edavies@george:~/node_modules/battery-level$ node cli.js
/home/edavies/node_modules/battery-level/index.js:24
res = res.percentage.slice(0, res.percentage.length);
^
TypeError: Cannot read property 'slice' of undefined
at /home/edavies/node_modules/battery-level/index.js:24:23
at /home/edavies/node_modules/battery-level/node_modules/linux-battery/index.js:29:3
at ChildProcess.exithandler (child_process.js:742:7)
at ChildProcess.emit (events.js:110:17)
at maybeClose (child_process.js:1015:16)
at Socket.<anonymous> (child_process.js:1183:11)
at Socket.emit (events.js:107:17)
at Pipe.close (net.js:485:12)
Ubuntu 14.04 LTS.
$ uname -a
Linux george 3.16.0-44-generic #59~14.04.1-Ubuntu SMP Tue Jul 7 15:07:27 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
$ upower --version
UPower client version 0.9.23
UPower daemon version 0.9.23
Toshiba Satellite C50-B-189
The problem seems to be that the battery is called …BAT1 rather than …BAT0
$ upower -i /org/freedesktop/UPower/devices/battery_BAT0
failed to set path: cannot refresh: Cannot get device properties for /org/freedesktop/UPower/devices/battery_BAT0: Couldn't call GetAll() to get properties for /org/freedesktop/UPower/devices/battery_BAT0: Method "GetAll" with signature "s" on interface "org.freedesktop.DBus.Properties" doesn't exist
$ upower -i /org/freedesktop/UPower/devices/battery_BAT1
native-path: BAT1
vendor: TOSHIBA
model: PABAS0241231
serial: 000000000000D01B
power supply: yes
updated: Fri 24 Jul 2015 17:03:42 BST (1498 seconds ago)
has history: yes
has statistics: yes
battery
present: yes
rechargeable: yes
state: fully-charged
energy: 45 Wh
energy-empty: 0 Wh
energy-full: 45 Wh
energy-full-design: 45 Wh
energy-rate: 1.905 W
voltage: 16.988 V
percentage: 100%
capacity: 100%
technology: lithium-ion
It might be relevant that I'm using a wireless mouse with a battery:
edavies@george:~/node_modules/battery-level$ upower --dump
Device: /org/freedesktop/UPower/devices/line_power_ACAD
native-path: ACAD
power supply: yes
updated: Fri 24 Jul 2015 17:03:37 BST (1583 seconds ago)
has history: no
has statistics: no
line-power
online: yes
Device: /org/freedesktop/UPower/devices/battery_BAT1
native-path: BAT1
vendor: TOSHIBA
model: PABAS0241231
serial: 000000000000D01B
power supply: yes
updated: Fri 24 Jul 2015 17:03:42 BST (1578 seconds ago)
has history: yes
has statistics: yes
battery
present: yes
rechargeable: yes
state: fully-charged
energy: 45 Wh
energy-empty: 0 Wh
energy-full: 45 Wh
energy-full-design: 45 Wh
energy-rate: 1.905 W
voltage: 16.988 V
percentage: 100%
capacity: 100%
technology: lithium-ion
Device: /org/freedesktop/UPower/devices/mouse_0003o046DoC52Fx0002
native-path: /sys/devices/pci0000:00/0000:00:14.0/usb1/1-4/1-4.2/1-4.2:1.1/0003:046D:C52F.0002
vendor: Logitech, Inc.
model: M185/M225
serial: 0320E001
power supply: no
updated: Fri 24 Jul 2015 17:29:25 BST (35 seconds ago)
has history: yes
has statistics: no
mouse
present: yes
rechargeable: yes
state: discharging
percentage: 90%
Daemon:
daemon-version: 0.9.23
can-suspend: yes
can-hibernate: no
on-battery: no
on-low-battery: no
lid-is-closed: no
lid-is-present: yes
is-docked: no
Error: Command failed: upower -e
(upower:13207): libupower-glib-WARNING **: Couldn't enumerate devices: Message did not receive a reply (timeout by message bus)
(upower:13207): UPower-WARNING **: failed to enumerate: Message did not receive a reply (timeout by message bus)
at ChildProcess.exithandler (child_process.js:202:12)
at emitTwo (events.js:106:13)
at ChildProcess.emit (events.js:191:7)
at maybeClose (internal/child_process.js:850:16)
at Socket.<anonymous> (internal/child_process.js:323:11)
at emitOne (events.js:96:13)
at Socket.emit (events.js:188:7)
at Pipe._handle.close [as _onclose] (net.js:492:12)
Tested on Linux 3.16.0-71-generic x86_64
Hi, this is great tool but I'd suggest you mention somewhere that it needs 'upower' to function on Linux. As that was not installed on my system by default.
This could be awesome feature :)
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