Auto Depot 250 Amp Jumper Cable The Pigtail Connector converts an existing SAE quick connector into a sealed indicator of the status of your battery. It also opens up for charging with a CTEK 12 Volt charger. Suitable for use with CTEK chargers MXS 5.0, and Lithium XS. Manufactured by CTEK, Scandinavia’s largest producer and developer of smart battery chargers and EV charging solutions. Designed in Sweden.