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4 Charging and battery operation
4.3
Battery operation
With new non-rechargeable alkaline batteries the
EX-TEC OD 4/
GM 4
will operate for 20 hours with the pump running or 50 hours
in diffusion operation.
Changing the batteries
When the batteries need to be changed, the battery compartment
can be opened with the screwdriver supplied (the two lower screws
on the back of the instrument). Insert the new cells the right way
round (as marked) and close the battery compartment again.
Once the old batteries are removed the date and time are pre-
served in the instrument for about
120 seconds
. If the battery
change takes longer than this, you will have to re-enter both values
next time it is switched on. No other data will be lost.
z
An
EX-TEC OD 4/GM 4
fitted
with non-rechargeable alkaline
batteries cannot be charged.
If you try to do so a warning
message is displayed and the
instrument must be removed
from the docking station.
The value for the operating-hours display for nickel/metal-hydride
batteries is lost if these are replaced by alkaline batteries, so if
nickel/metal-hydride batteries are inserted again they must first
be
fully discharged
and then recharged. This ensures that the
available operating hours will be correctly displayed.
charge aborted
Alcaline-
battery