14
BATTERY VOLTAGE AND USAGE
Given the variety of tests and surveys that exist in the downhole environment, a definitive
guideline for battery usage is impossible. The technician needs to use a certain amount of
judgment on when to use or not to use a particular battery pack. The decision should be based on
three things.
1. The length of the test (survey) to be run.
2. The amount of time a battery has been used.
3. The voltage the battery shows on the communication box.
In order to measure battery’s charge level, connect battery to the comm. Box, which in its turn
should be connected to the gauge and computer
The circuit board electronics of both the strain and quartz gauges requires approximately 3 volts
minimum to operate correctly. And the quartz transducer requires 6.5 volts minimum to operate
correctly. Since lithium batteries maintain the maximum stated voltage for the useable life of the
battery; once the voltage starts to drop their useable life is short indeed.
For example: Our AA batteries are rated at 1.5Ah. But this number is taken after 80% of the life
has been used. The remaining voltage is approximately 2.5volts. Not enough to operate the
gauge properly. 1Ah leaves approximately 3-3.2volts left. Realistically the battery should not be
used past 1Ah. Of course this is where the judgment of the operator comes into play. Also, do not
forget that sometimes lithium batteries passivate (go to sleep) and need to be awakened. This
can cause the voltage to be much lower than it really is. You can wake them up by shaken them
up or using the battery load tester.
In order to check battery voltage, insert the load tester with battery on it into the Multi-meter.
Voltage, that you will see, is the voltage of the battery without any load. Push 100om button on
the tester to imitate circuit board load and observe battery voltage.
Recommendation:
AA lithium- with 380 ohm load adapter- 3.1 volts.... Do not use.
C lithium - with 380 ohm load adapter- 6.1 volts….Do not use.
If you use batteries all the time, there is a little chance they’re going to passivate (read the
Passivation of Lithium Cells chapter down-bellow). But if you think it’s happened, push 10om
button on the Quartz load tester and 20om on Strain for wakening up them up.
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