Closing 1s battery connector
These two wire cables with connectors are not easily repairable. The contacts in the connector are special parts that are crimped onto the end of the wire with a special tool. A repair would entail purchasing both the contacts and the crimping tool. This would be horrendously expensive compared to just purchasing some new cables. For LiPo battery applications you can get these types of cables inexpensively from Sparkfun, Adafruit and even on Amazon.



(Picture Source: https://www.amazon.com/Shappy-Pieces-Connector-Silicone-Female/dp/B07449V33P)