The XT30 are highly used on 200mm size quads (drones) or smaller depending on the current drawing.
They much smaller than their big brother XT60 and rated up to 30A of continuous current consumption.
 

Features:
• Gold plated Connections
• Long connection contact points for better current flow
• Fills a gap for the Mini connectors
• Small and light weight

Specs:
Amps: 30A Continuous
Weight:0.9g female
Size:  Female=13x11x6mm
Contact current transfer size: 2x6mm

Package includes:

• 1 Male connector
• 1 Female connector