It depends on the rate that you charged it at. If the charging rate is high then the battery can get quite hot. If you are concerned .about the temperature of the battery you can lower the charging rate. It is recommended to add the optional temperature sensor so that you can monitor the battery temperature. You can then set a battery temperature that will cause the charger to shut off. If you use the charging app you can watch the temperature change in the graph. See:
https://www.hobbywarehouse.com.au/skyrc-600040-01-temperature-sensor.html
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