Hi I have had an accident today I was flying and somehow cut threw the balance charge wire can I repair it also I accidentally sparked the 2 wires together would that do damage? Is it possible to repair or should I discard it?

Search out "JST Kit" you should be able to find them on Amazon if the break is in the plastic. You can also get balance jumpers with a length of wire already attached if you want to take it down to the battery or splice it onto the wire.

Then just take one balance lead at a time to switch over to the new plug that way you don't mix up the order as they need to be kept in order for the charger.

Minimal sparking should be fine, the greater issue would be if the wires were stuck together for a length of time causing that cell(s) to overheat. Not something you want to do purposefully.