while charging the gear watch active2 pop-up window suddenly appears

Q : While charging the Gear Watch Active2, pop-up window about “Battery needs to cool” suddenly appears and stops the charging. Why is this?

A : During charging, the device and the charger may become hot. Also, your device may heat up due to the exterior environment conditions(i.e. using for extended periods in very hot areas, storing device in very cold or very hot temperatures, exposure of device to direct sunlight. Etc.) 

When the device heats up or becomes to specific temperature during charging or using, algorithm to protect device’s overheating operates and accordingly the features and performance may be limited with “Battery needs to cool” pop-up. 

This is a normal operation to prevent damage to the device. Wait for the device to cool down and then begin using or charging the device again.