ECOTEST DKG-21 Operating Manual page 31

Charging should be carried out at ambient temperature ranging
0
from 0 to 45 C.
The lithium-ion battery of the dosimeter has no memory effect, so you
can charge the battery regardless of its state of discharge.
4.2.3.2 To charge the storage battery, unpack the charger and connect it
to the industrial network of 100-240 V, 50-60 Hz. Insert a plug (1) of the
charger (2) into the dosimeter's inlet (3) according to Figure B.3. While the
dosimeter's storage battery is being charged red LED is lit. At the end of
charging, a red LED turns off while a green one lights up. Then you should
disconnect the dosimeter from the charger, and the charger from the
network.
4.2.3.3 The storage battery may be charged with the dosimeter on or off.
4.2.4 Guidelines on switching on and testing the dosimeter
4.2.4.1 Prepare the dosimeter for operation. Do the following:
- unpack the dosimeter;
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