This is the Team Integy EC2 Skidproof 2 mm Connector Set
Blue plastic housing with two each 2 mm diameter male and female connectors
Ideal for battery to ESC connections
Two EC2 Skidproof 2 mm Connectors
Soldering leads to connectors
The contacts install wire side into the housing. This is backwards from other brands of EC connectors.
Order of assembly:
1. insert wire through plastic housing
2. strip and tin wire
3. pre-tin connector contact being careful to keep solder inside cup
4. solder wire into contact
5. seat contact into housing