Robot LEDs

I’ve seen teams in the past that have LEDs to act as under glow for their robot. Is this simply done by connecting some LEDs to a separate small battery? Yet this violates the rule of one battery per robot sooo… how is this done?

check rule R8(e)

but addressable LED can also be connected to the V5 brain or 3wire expander, search the forum for more details.


extra battery for decorations is fine.