Notes:
The above figures are estimated in lab conditions using 2 SAFT LSH 14 batteries with a nominal voltage of 3.6V
(
SAFT LSH 14 batteries product sheet
).
Type of sensors used for the calculation: 7.5 x 7.5Kohm potentiometer, , 3K thermistor and 300ohm wheatstone
bridge strain gauge.
As mentioned, temperature and spreading factor have effects on the the batteries’ lifespan as shown in the
following table:
Temperature
profile:
Singapore
(average temp. 31ºC)
Barcelona
(average temp. 19ºC)
Moscow
(average temp. 7ºC)
Sampling rate
SF8
SF9
SF8
SF9
SF8
SF9
5min
2
1.9
2.1
2
2.2
2
1h
8
7.8
9.1
9
9.7
9.5
6h
9.8
9.8
11.7
11.7
12.8
12.8
Figure 43. Table showing the estimated battery duration average in years for different SR, SF and Tª profiles. Source: SAFT
Data Acquisition and storage
Data is stored in the laser node in comma-separated variable (.csv) files. These files are available to download using
the Android DLog application. Both readings and health files can be downloaded. For this purpose, an Android
device must be connected to the node Mini USB port with a USB-OTG cable. When the DLog application loads, data
can be downloaded by clicking on the Download arrow-shape icon in the Sensors Data tab as shown in Figure 44. A
Start and End date must be set, and data from that period will be downloaded (Figure 45). The Android device
allows these .csv files to be opened with applications such as email or cloud apps. Files are also stored on the
device memory, on the SD Card, or in the DLog folder.
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