Battery Life

The following values have been obtained by monitoring each logger type under various logging conditions. As can been seen from this table, there are two important factors in determining battery life. One is the use of Average, Maximum or Minimum readings and the other is low temperatures.
Values shown for "Logging Interval 1 Minute NO Average, Max or Min" and "Logging Interval 1 Minute
Average, Max or Min on at least 1 channel" are for continual running - never stopping the logger.

Average, Maximum or Minimum Readings

When Average, Maximum or Minimum readings are taken, the logger reads the attached sensors every second and then calculates the average, maximum or minimum at logging time. If the logger is running continually over long periods, and sensors are being powered up every second, battery life will be shortened. On the other hand if the logger is only being used a few days per week or a week per month and is being stopped for the periods it is not in use then there will be no appricable battery life shortning when using average, maximum or minimum readings.

Low temperatures (less the -5ºC)

Any battery will produce a lower voltage at lower temperatures. The voltage will recover as the temperature increases. However if the low temperature causes the battery voltage to drop to a point where the microprocessor in the logger can no longer function, this will cause the logger to stop. As the temperature increases and the battery voltage comes back up the microprocessor will reset at power up and the logger status will show "Stopped" with 0 samples.