Rae MiniRAE Plus PGM-76, Operation And Maintenance Manual, Page: 43 / 168

SECTION 3 OPERATION OF ACCESSORIES
3 - 3
As the battery becomes older or operated under adverse
conditions, the battery capacity will be reduced significantly.
The battery of the MiniRAE Plus unit will be drained slowly
even if the unit is turned off. If the unit has not been charged
for 4-5 days, the battery voltage will be low. The charging
circuit is designed to prevent over charging. Therefore, it is a
good practice to always leave the unit in the charger when it is
not used so that it is fully charged and ready for immediate use.
There is an optional single station battery charger accessory
for the MiniRAE Plus Professional PID Unit. This charger will
allow users to charge a spare battery outside the unit. Plug the
battery to the jack on the back of the charger to charge the
spare battery.
There is also an optional automotive charging adapter cable
which allows user to charge the MiniRAE Plus unit directly from
the 12 V cigarette lighter socket inside a car.