update according to pull request review comments

src/modules/sensors/sensor_params_battery.c

@@ -98,7 +98,7 @@ PARAM_DEFINE_FLOAT(BAT_A_PER_V, -1.0);
  * means that measurements are expected to come from a power module. If the value is set to
  * 'External' then the system expects to receive mavlink battery status messages.
  *
- * @min -1
+ * @min 0
  * @max 1
  * @value 0 Power Module
  * @value 1 External

src/modules/sensors/voted_sensors_update.cpp

@@ -626,7 +626,6 @@ void VotedSensorsUpdate::accel_poll(struct sensor_combined_s &raw)
 
 	// write the best sensor data to the output variables
 	if (best_index >= 0) {
-		raw.timestamp = _last_sensor_data[best_index].timestamp;
 		raw.accelerometer_integral_dt = _last_sensor_data[best_index].accelerometer_integral_dt;
 		memcpy(&raw.accelerometer_m_s2, &_last_sensor_data[best_index].accelerometer_m_s2, sizeof(raw.accelerometer_m_s2));