what difference will the lipo battery make as opposed to the one that comes as standard is it a big increase in speed or lengh of runtime ect .................... orion sport power 3300 stick pack 7.2 volts or the overlander sport 7.4 volt 3350 25c lipo stick pack ( speed passion rs2 ) was wondering wether it was worth paying the extra im new to all this rc stuff so i think a big increase in speed maybe a NO NO,another thought do lipo batterys last longer and whats the difference in charging times ? i know theres a lot to answere here but im new to all this any info gratefully received THANKS