With a deans connector

it will be too much of a jump. i would recconmend a 2s (7.4V) lipo battery

Depending on the size of the lipo battery pack will determine how often you should recharge it. Many models will emit a signal that makes the user aware that their device is in need of charging. http://www.rchelisite.com/lipo_battery_charging_and_safety_guide.php

yes,but it might mess with your esc I have tried it stock with turnegy battery packs because I had an replacement esc for e sav but I have used 8.4v 5000mah turnegy in it stocked and wow fast compared to stock 7.2v batts suggest get better esc

35-40 mph with 2s lipo battery