GE USM 36 Series Technical Reference And Operating Manual page 46

3 Initial start-up Power supply
Checking the charge level of the lithium-ion battery
The lithium-ion battery is provided with a battery charge
level indicator. Four light-emitting diodes (1) indicate the 1
2
level of battery charge. Check the battery charge level
before inserting it into the instrument.
The number of diodes that are lit up has the following
meaning:
● 4 LEDs: Battery charge level 100 ... 76 %
● 3 LEDs: Battery charge level 75 ... 51 %
● 2 LEDs: Battery charge level 50 ... 26 %
● 1 LED: Battery charge level 25 ... 10 %
● 1 LED is flashing: Battery charge level <10 %
– Press the key (2) next to the LEDs. The LEDs indi-
cate the battery charge level.
3-6 Issue 2 (12/2013) USM 36