What size batteries is everyone using. I bought my truck used and it came with two Gensace saddle packs 25c 4800mah and during my 7 min main i ran out of juice. It was at the sixth minute power started to drastically drop. It's running a Tekin 5.5 and a mamba max pro sct esc. Perhaps the batteries are dying?? They gave unknown runs through them and seem slightly weathered.