Battery capacity stuck at 100% if "last_full_capacity = true"

**This is a copy of the [issue](https://github.com/i3/i3/issues/2512) I wrongly filed in i3/i3 repository:**

Output of `i3 --moreversion 2>&- || i3 --version`:

```
Binary i3 version: 4.12 (2016-03-06, branch "4.12") © 2009 Michael Stapelberg and contributors
Running i3 version: 4.12 (2016-03-06, branch "4.12") (pid 865)
Loaded i3 config: /home/mochobb/.i3/config (Last modified: sex 07 out 2016 18:16:35 WEST, 1293372 seconds ago)

The i3 binary you just called: /usr/bin/i3
The i3 binary you are running: i3
```

URL to a logfile as per http://i3wm.org/docs/debugging.html:

[logs.i3wm.org/logs/5651442522128384.bz2](logs.i3wm.org/logs/5651442522128384.bz2)
[i3bar.bar-0.log.txt](https://github.com/i3/i3/files/546006/i3bar.bar-0.log.txt)

**What I did:**

I changed i3status.conf to indicate the correct "uevent" path and set `last_full_capacity = true`

My current i3status.conf battery block:

```
battery 0 {
# format = "%status %percentage %remaining %emptytime"
format = " %status %percentage %remaining "
format_down = " no battery "
last_full_capacity = false
integer_battery_capacity = true
hide_seconds = true
# status_chr = ""
status_chr = "⚡"
# status_bat = ""
# status_bat = "bat"
status_bat = "☉"
# status_full = ""
status_full = "☻"
low_threshold = 10
threshold_type = percentage
path = "/sys/class/power_supply/C11F/uevent"
}
```

My current "uvent" file:

```
POWER_SUPPLY_NAME=C11F
POWER_SUPPLY_STATUS=Full
POWER_SUPPLY_PRESENT=1
POWER_SUPPLY_TECHNOLOGY=Li-ion
POWER_SUPPLY_CYCLE_COUNT=0
POWER_SUPPLY_VOLTAGE_MIN_DESIGN=14800000
POWER_SUPPLY_VOLTAGE_NOW=16293000
POWER_SUPPLY_CURRENT_NOW=0
POWER_SUPPLY_CHARGE_FULL_DESIGN=1698000
POWER_SUPPLY_CHARGE_FULL=1698000
POWER_SUPPLY_CHARGE_NOW=1698000
POWER_SUPPLY_CAPACITY=100
POWER_SUPPLY_CAPACITY_LEVEL=Full
POWER_SUPPLY_MODEL_NAME=Primary
POWER_SUPPLY_MANUFACTURER= Hewlett-Packard
POWER_SUPPLY_SERIAL_NUMBER=00 CC 10 A2 00 64 30 00
```

**What I saw:**

The battery current capacity is always shown as 100%, irrespective of the value directly got from the "uevent" file. This doesn't happen if I set `last_full_capacity = false`.

EDIT: if i3status.conf is edited setting `last_full_capacity = true` and i3 reloaded, this behaviour isn't visible. It only happens if one logs out and back in or after rebooting. Setting `last_full_capacity = false` consistently results in correct behaviour across reboots.

**What I expected instead:**

I expect the current capacity to be updated as the battery looses it's capacity when the power cord is unplugged. The correct behaviour occurs if I set `last_full_capacity = false`.

Thank you very much for taking the time to read this.