px4-firmware/msg/battery_status.msg

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uint64 timestamp # microseconds since system boot, needed to integrate
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 discharged_mah # Discharged amount in mAh, -1 if unknown
float32 remaining # From 1 to 0, -1 if unknown
int32 cell_count # Number of cells
#bool is_powering_off # Power off event imminent indication, false if unknown
uint8 BATTERY_WARNING_NONE = 0 # no battery low voltage warning active
uint8 BATTERY_WARNING_LOW = 1 # warning of low voltage
uint8 BATTERY_WARNING_CRITICAL = 2 # alerting of critical voltage
uint8 warning # current battery warning