NVI-MAG
ENVI-MAG Manual A7-1
Chapter
Maintenance
7
Maintenance and Repair
Battery charging
The ENVI-MAG uses lead-acid batteries. These are a reliable power source when
properly maintained. They can provide power through a few hundred charge/
discharge cycles. However, the main source of trouble with these batteries is deep
discharge. This occurs when the battery is fully discharged and left discharged for
an extended period.
To prevent deep discharge in the ENVI-MAG, electronic circuitry monitors the
battery voltage and shuts the instrument down when the battery has reached its
lower operating level. It should then be recharged as soon as possible. However,
the instrument draws a small current even when turned off. If the ENVI-MAG is left
in a discharged state, for even a few days, then the battery will eventually deep
discharge. Once this has happened, you will need to replace the deep-discharged
battery with a new one (SCINTREX part no. 400 078 or 400 080).
Warning: The small current drain just mentioned above, is the reason why the
battery
MUST BE DISCONNECTED FOR SHIPMENT AND STORAGE. Batteries
also self discharge slowly, therefore, they must be recharged
periodically, e.g. every 3 months, even when in storage. Finally, batteries
should also be stored at room temperature, or as close to it as possible.
Up to two batteries can be charged at the same time. If high capacity batteries are
charged, such as those used in the External Heavy Duty Battery Pack, it is
important that the charging begin right after work and continue over night.
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