Like this one (30 seconds google) Losi Micro-B Lipo 2S Balance XT60 Charge Lead 24” Cable PH2.0 (SPMX-1090) | eBay

Looks like it has a normal JST XH balance connector so there are plento of cables to find to charge only over the balance connector. If you get a balance extension cable you can add a charging lead to it. Like Charge Cable For 2s Packs with Balance Connector Only - www.readymaderc.com
and ProTek RC Receiver Balance Charge Lead (2S to 4mm Banana w/4S Adapter) [PTK-5319] - AMain Hobbies