All E100 Series routers indicate battery status through the Power LED (). The Power LED changes color and behavior based on the battery condition:
Solid Green – The battery is installed and working correctly, but the router is running on AC power.
Blinking Green – Powered by the battery.
Solid Yellow – Battery may need attention; example the battery is at less than 20% of charge.
Blinking Yellow – The battery needs to be replaced or the installed battery can only hold 60% or less of its original capacity.