This is the Duratrax Banana Charge Leads to XT90 Battery Connector.

FEATURES: Connects a battery with an XT90 connector to a battery charger
with 4mm diameter female banana output jacks
One year limited warranty through Hobby Services beginning at date of
purchase. Warranty valid in the U.S.A. and Canada only

INCLUDES: Duratrax Banana Charge Leads to XT90 Battery Connector

SPECS: Length: 4" (102mm) not including connectors
Battery Connector: XT90
Charger Connector: 4mm diameter male banana jacks
Wire Size: 14AWG