EC3 Connector Set : 1 Male (Battery end) housings with gold-plated pins already installed, and 1 Female (motor/charge end) housings with gold-plated pins already installed.

These newly-designed EC3 connectors are much easier to work with. The pre-installed gold-plated pins accept solder extremely well, and the blue housings are heat-resistant.

Note: The Blue connector that goes on a Battery pack is the one with the narrower blue tips (more space between them). The Blue housing with wider tips goes on the Charger or motor. Also, the blue tips with the squared end are typically POSITIVE (+ Red wire); the Semi-Circle end is typically NEGATIVE (-). Replaces original part # EFLACE303