MAV_BATTERY_CHARGE_STATE_UNDEFINED=0,/* Low battery state is not provided | */
MAV_BATTERY_CHARGE_STATE_OK=1,/* Battery is not in low state. Normal operation. | */
MAV_BATTERY_CHARGE_STATE_LOW=2,/* Battery state is low, warn and monitor close. | */
MAV_BATTERY_CHARGE_STATE_CRITICAL=3,/* Battery state is critical, return or abort immediately. | */
MAV_BATTERY_CHARGE_STATE_EMERGENCY=4,/* Battery state is too low for ordinary abort sequence. Perform fastest possible emergency stop to prevent damage. | */