M2M Control CX660 Technical Manual V1.02
Advanced Automotive M2MI/IoT Gateway
Page 30 of 44
Internal Li-Ion battery
The CX660 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 analog outputs will be disabled when power failure occurs as the internal battery cannot
provide the supply voltage needed.
The battery charging is completely automated and handled internally by the CX660 – 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 shorter charge time, as specified in the technical
specification. Make sure both power supply and cables can handle the high current.
The battery will be charged whenever a power fail occurred to establish the capacity, thus making
the battery ready for the next power failure. A maintenance charge will start every 20 days after
the last charge. This is to compensate for the battery self-discharge etc.
By default, the battery cannot be charged above 45
C or below 0
C. The CX660 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 very 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 RTCU device may cause the built-in battery security circuit to be damaged.
Do not place the RTCU device in high-temperature locations such as in direct sunlight or near
engines. Using the RTCU 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.
For more information regarding the environmental limitations, see “Specifications for M2M
CONTROL CX660” below or consult the M2M CONTROL CX660 datasheet.
