Hello, I use a Siemens/Cinterion MC55 in my application. Since I can't use the integrated battery charging manager, I have to use an external one. The battery (Li-Ion) is still connected directly to the BATT pins. I suppose I need a 10K dummy resistor at BATT_TEMP to tell the module the battery is there. Will the AT^SBC command work in this situation? How does it calculate the remaining battery capacity? Is it just based on the voltage or does it need to know when and how the battery has been charged? - Thanks, Obi
The AT^SBC read command for the battery capacity corresponds to the battery voltage and the parameter for the discharge curve of the battery. A standard parameter is loaded in the module. It is possible to read the battery capacity but it would be a close approximation. NTC is only used for determining charging algorithm and temperature readings. You can load custom battery parameter for your specific battery prepared by Cinterion for the most precise measurement but for most applications, standard battery parameters are OK for level reading.
As part of a specific customer project to be agreed between the integrator and Cinterion, customized battery parameters can be prepared by Cinterion. These can be uploaded into the MC55i via a specific tool, not via AT commands like AT^SBC. As said before, this is most of the time not needed though.
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