Dell Latitude 14 Rugged Extreme – 7414 Owner's Manual

Your system ships with a non-hot swappable battery. You also have an option to select a hot swap battery.

Hot swap battery

This section explains what happens when you swap the battery.

The BIOS allows 1 minute to swap the hot swap battery if there is sufficient charge and the temperature is 0º–60º C. When swapping the battery, the LCD, backlight and all LEDs turn off and the processor enters a low power state to reduce system power. The battery LED flashes green/amber (once per second) for the first 45 seconds. For the last 15 seconds, the green/amber flashes at a faster rate to indicate that the swap time limit is near. If the 1-minute time is exceeded, the unit attempts to enter the Sleep (S3) state. If the user has disabled S3 or the OS fails to enter S3 entering Sleep is not guaranteed. When the system enters the sleep (S3) state, the battery LED continues to flash green/amber at the faster rate to indicate to the user that a power source needs to be installed. 

If the hot swap battery is not charged to a sufficient level or the temperature is outside the mentioned range and the user performs a hot swap, the BIOS puts the system into the Sleep (S3) state and flashes the battery LED at a faster green/amber rate.