M2M Control CX320 Technical Manual V1.01
Page 32 of 42
Rechargeable Li-Ion Backup Battery
The CX320 contains an internal Li-Ion battery for operation even when the external power is absent,
making it possible to report power loss etc. Please note, that when external power is removed, the
device will be powered down by default. This setting can be changed as documented in the M2M
Control IDE documentation.
The digital and analog outputs will be disabled when a power failure occurs as the internal battery
can not provide the supply voltage needed.
The battery charging is entirely automated and handled internally by the CX320 device – leaving no
need for user interaction. Different kinds of functions (Battery low, Charger enable, charging status,
etc.) are available to the user application.
The charge current is relatively high, for a shorter charge time, as specified in the technical
specification. Make sure both the power supply and cables can handle the high current.
Whenever a power failure has occurred, the battery will be charged to establish the capacity, thus
making the battery ready for the next power failure.
By default, the battery cannot be charged above 45
°
C or below 0
°
C. The CX320 offers to charge down
to -10 ˚C using a specialized algorithm to protect the battery.
If the temperature is above 45
°
C, the charging will not start and will be postponed, until it is below
this threshold.
The temperature has a strong influence on the battery capacity. At 0
°
C the capacity has dropped to
60% of the initial capacity, and it falls dramatically at lower temperatures.
The battery cycle (numbers of charges and discharges) also influences the capacity. After 300 cycles
the capacity has dropped to approximately 80% of the initial capacity.
Warning
Misusing the CX320 device may cause the built-in battery security circuit to be damaged.
•
Do not place the CX320 device in high-temperature locations such as in direct sunlight or near engines.
Using the CX320 device in this environment may result in loss of battery performance and a shortened
life expectancy.
•
Do not expose the device to water, saltwater or allow the battery to get wet.
•
Avoid strong impacts and shocks.
