Updated batt_smbus. Expanded battery_status.msg. Fixed mavlink_messag…

…es.cpp temperature. (#8991)

* Updated and expanded batt_smbus to work with bq40z50-R2. Expanded battery_status.msg. Fixed mavlink_messages.cpp temperature, added commented out expanded battery_status.msg parameters for future mavlink expansion.

* Changed errx to PX4_ERR

* Added PX4_ERR returns

msg/battery_status.msg

@@ -2,13 +2,21 @@ float32 voltage_v		# Battery voltage in volts, 0 if unknown
 float32 voltage_filtered_v	# Battery voltage in volts, filtered, 0 if unknown
 float32 current_a		# Battery current in amperes, -1 if unknown
 float32 current_filtered_a	# Battery current in amperes, filtered, 0 if unknown
+float32 average_current_a		# Battery current average in amperes, -1 if unknown
 float32 discharged_mah		# Discharged amount in mAh, -1 if unknown
 float32 remaining		# From 1 to 0, -1 if unknown
 float32 scale		# Power scaling factor, >= 1, or -1 if unknown
+float32 temperature         # temperature of the battery
 int32 cell_count		# Number of cells
 bool connected			# Whether or not a battery is connected, based on a voltage threshold
 bool system_source		# Whether or not a this battery is the active power source for VDD_5V_IN
 uint8 priority        	# Zerro based priority is the connection on the Power Controller V1..Vn AKA BrickN-1
+uint16 capacity         # actual capacity of the battery
+uint16 cycle_count         # number of discharge cycles the battery has experienced
+uint16 run_time_to_empty   # predicted remaining battery capacity based on the present rate of discharge in min
+uint16 average_time_to_empty   # predicted remaining battery capacity based on the average rate of discharge in min
+uint16 serial_number       # serial number of the battery pack
+
 
 bool is_powering_off		# Power off event imminent indication, false if unknown