I have a traxxas rustler and just bought some duratrax 8.4v 5000mah batteries. They only have about 8-10 runs on them and i went to run one and i knew it was at 100%. It runs great for about 5 muinets then it acts like it is dead, but when i plug it in to my venom peak charger i only takes 300mah then it stops. I was wondering if I could put it on a discharg/charge cycle to restore it but i didn't yet. I want to know if it would be a good idea to do that or if their is anything else i could do.

please help me and thanks in advance.