Ok.is the rx antenna broken at all?. is it broken inside the protective coating? fresh batteries in radio and rc?.so this is the 1/18 scale ruckus then.. any nimh battery charger will charge that battery . it being 900 mah tell me you need to charge at less than 1 c.. id say 1/2 amp.. you might need to condition battery to get a full complete charge into it.. thats the lowest charge your charger can do like .01 amp it will take maybe 16 hours or so.. that will bring all cell up to 1.48 volts with a 900mah bat. your run time might be in the half hour range.
Fresh batteries in both and no breaks that I can see. See I want to get better run time and faster charge time. 9 hours to charge is kinda dreadful I really want to switch up to lithium components but don't know if it was possible to with this one...also I can't get my transmitter on the RC to stay in place...I have replaced the double sided tape and still having issues.
The stock esc doesn't have a lipo cutoff, it isn't really rated for use with lipos. The stock brushed motor will run also hotter with a lipo battery. Longer runtimes will lead to increased heat which can lead to the stock motor burning up.