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Example 2. Li-Po battery attached, 25ºC ambient temperature
Example 2 has the same charging time (indicated by the blue arrow) as in example 1 (6 hours 30
minutes); at this time the battery is fully charged; checking using the AT^SBV command, we discover that
it is around 4.40V (indicated by the green arrow).
Discharging time in these conditions is around 12 hours, so the more often you connect to GPRS, the
shorter the battery will last. Keep GPRS connections short and infrequent where possible to extend
battery life if you require longer periods of use without charging.
External power connected from 0:00 to 7:00 and only battery powered from 7:00 to 20:00. Java application
running and storing the GPS position on the flash storage every five minutes, and transmitting positions
by GPRS every 30 minutes. Connected to the Movistar GPRS network.
Note: there are two internal LEDs that provide information about the battery status:
• A red LED will illuminate when the battery is charging
• A green LED will illuminate when external power is applied
MTX-Java-IoT | 2018/2
MTX © by MATRIX ELECTRONICA S.L.U.
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