Do not use device if it had to be turned off because of critical battery level.

build/android/buildbot/bb_device_status_check.py

 #!/usr/bin/env python
 #
 # Copyright 2013 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """A class to keep track of devices across builds and report state."""
 import json
 import logging
 import optparse
@@ skipping 63 matching lines @@
             '  Build: %s (%s)' %
               (device_build, device_adb.GetProp('ro.build.fingerprint')),
             '  Current Battery Service state: ',
             '\n'.join(['    %s: %s' % (k, v)
                        for k, v in battery_info.iteritems()]),
             '  IMEI slice: %s' % imei_slice,
             '  Wifi IP: %s' % device_adb.GetProp('dhcp.wlan0.ipaddress'),
             '']
 
   errors = []
+  dev_good = True
   if battery_level < 15:
     errors += ['Device critically low in battery. Turning off device.']
+    dev_good = False
   if not options.no_provisioning_check:
     setup_wizard_disabled = (
         device_adb.GetProp('ro.setupwizard.mode') == 'DISABLED')
     if not setup_wizard_disabled and device_build_type != 'user':
       errors += ['Setup wizard not disabled. Was it provisioned correctly?']
   if (device_product_name == 'mantaray' and
       battery_info.get('AC powered', None) != 'true'):
     errors += ['Mantaray device not connected to AC power.']
 
   # Turn off devices with low battery.
   if battery_level < 15:
     try:
       device_adb.EnableRoot()
     except device_errors.CommandFailedError as e:
       # Attempt shutdown anyway.
       # TODO(jbudorick) Handle this exception appropriately after interface
       #                 conversions are finished.
       logging.error(str(e))
     device_adb.old_interface.Shutdown()
   full_report = '\n'.join(report)
-  return device_type, device_build, battery_level, full_report, errors, True
+  return device_type, device_build, battery_level, full_report, errors, dev_good
 
 
 def CheckForMissingDevices(options, adb_online_devs):
   """Uses file of previous online devices to detect broken phones.
 
   Args:
     options: out_dir parameter of options argument is used as the base
              directory to load and update the cache file.
     adb_online_devs: A list of serial numbers of the currently visible
                      and online attached devices.
@@ skipping 260 matching lines @@
     # devices with critically low battery. Remove those devices from testing,
     # allowing build to continue with good devices.
     return 2
 
   if not devices:
     return 1
 
 
 if __name__ == '__main__':
   sys.exit(main())