How to do when the mini soc drops under the mini soc 10% you have set?

It is normal, when the soc drops to mini -5%, it will be charged to the mini soc you have set:10%. Also when the battery soc is lower than 15% and the temperature is lower than 3 degree, the battery will also be charged to 20%.

And when the battery cell voltage is less than 2.95v, the battery will also be charged.