SIAM DU-1, Руководство по эксплуатации

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Well sounders «DU-1»
8. BATTERY CHARGE
The well sounder has the same type of built-in Li-Ion - battery. The
battery is charged at a temperature not lower than 0 ° C. Charging is
allowed at temperatures down to -20°C. To charge the battery, connect the
device via an appropriate cable to a network or car adapter or USB port of
your computer. The charging time of a fully discharged battery is
approximately 7 hours.
The voltage of a fully charged battery is 4.1 -
4.2V. Rated voltage is 3.7 - 3.8V. At temperatures
below -30°C, the battery voltage may drop to 2.7V.
When the sensor is connected to the adapter,
the "Power" and "Charging" LEDs will light up
orange. After charging is complete, the "Charge" LED
lights up green.