Android bots: set battery threshold to 80%

platform_tools/android/bin/adb_wait_for_device

 #!/bin/bash
 #
 # Wait for the device to be ready to run tests.
 
 SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
 source $SCRIPT_DIR/android_setup.sh
 source $SCRIPT_DIR/utils/setup_adb.sh
 
 # Helper function used by get_battery_level. Parses the battery level from
 # dumpsys output.
@@ skipping 54 matching lines @@
 
 set -e
 
 # Wait for the device to be connected and fully booted.
 while [ "$($ADB $DEVICE_SERIAL shell getprop sys.boot_completed | tr -d '\r')" != "1" ]; do
   echo "Waiting for the device to be connected and ready."
   sleep 5
 done
 
 # Wait for battery charge.
-DESIRED_BATTERY_LEVEL=100
+DESIRED_BATTERY_LEVEL=80
 CURRENT_BATTERY_LEVEL="$(get_battery_level)"
 while [ "${CURRENT_BATTERY_LEVEL}" -lt "${DESIRED_BATTERY_LEVEL}" ]; do
   echo "Battery level is ${CURRENT_BATTERY_LEVEL}; waiting to charge to ${DESIRED_BATTERY_LEVEL}"
   sleep 5
   CURRENT_BATTERY_LEVEL="$(get_battery_level)"
 done
 
 echo "Ready!"