The power.CheckStatus test fails sometimes because it verifies that the battery charge reported in sysfs doesn't exceed the "full_charge" reported in sysfs.

From the elm job at http://pantheon/storage/browser/chromeos-autotest-results/178648467-chromeos-test/chromeos2-row7-rack7-host3/ :

2018/02/22 23:08:53 Started test power.CheckStatus
2018/02/22 23:08:53 [23:08:52.698] Error at check_status.go:37: Battery charge 3.8 exceeds full charge 2.0

Device: Line Power
  path:                    /sys/class/power_supply/CROS_USB_PD_CHARGER0
  online:                  yes
  type:                    USB_PD
  enum type:               AC
  voltage (V):             14.791
  current (A):             0
  max voltage (V):         15
  max current (A):         3
  active source:           CROS_USB_PD_CHARGER0
  available sources:       CROS_USB_PD_CHARGER0* [0/ff00]
  supports dual-role:      yes
Device: Battery
  path:                    /sys/class/power_supply/sbs-1-000b
  vendor:                  PANASONIC
  model name:              AP15O5L
  serial number:           080a
  state:                   Fully charged
  voltage (V):             12.473
  energy (Wh):             37.86
  energy rate (W):         0
  current (A):             0
  charge (Ah):             3.786
  full charge (Ah):        1.963
  full charge design (Ah): 4.67
  percentage:              100
  display percentage:      100
  technology:              Li-ion

See also veyron_minnie at http://pantheon/storage/browser/chromeos-autotest-results/178738578-chromeos-test/chromeos4-row9-rack10-host16/ :

Device: Line Power
  path:                    /sys/class/power_supply/gpio-charger
  online:                  yes
  type:                    Mains
  enum type:               AC
  voltage (V):             0
  current (A):             0
  max voltage (V):         0
  max current (A):         0
  active source:           gpio-charger
  available sources:       gpio-charger* [/]
  supports dual-role:      no
Device: Battery
  path:                    /sys/class/power_supply/bq27500-0
  vendor:                  Texas Instruments
  model name:              C100-80
  serial number:           
  state:                   Fully charged
  voltage (V):             4.283
  energy (Wh):             8.291
  energy rate (W):         0
  current (A):             0
  charge (Ah):             7.734
  full charge (Ah):        7.702
  full charge design (Ah): 8.06
  percentage:              100
  display percentage:      100
  technology:              Li-ion