Charging at 7a is ok for the occasional charge (I mean occasional) I certainly wouldn't do it regularly, get in the habbit of charging the night before even if its raining the next day and you cant go out they will be fine for a couple of weeks or more, some people will disagree with this all I can say is ive done this, some of my Lipo's are 3 tears old and are fine. As has been said charge yours at 5.6a for the 5000 and 5.6 for the 5600, I also balance charge mine every time this is more habit that a necessity balance charging does take slightly longer depending how out of balance your lipo's are you could normal charge and just do a balance charge every 5 cycles or so. What ever your running your Lipo's in make sure the ESC is set for Lipo and LVC is set, get your self a battery checker I try never to take mine below 20% if that means getting another Lipo to be able to stay out and play so be it they will last for years.