I run that protek life hump pack and its alittle smaller then that stickman you are running but on many cars you will have to charge it in the cars battery box because you may have to take the box apart to get in in there in the first place ( like the stickman).
I personally only run LIFE receiver packs now. It has Almost all of Lipo's advantages and then some with none of its disadvantages.for me regular voltage servo's already over perform so I dont need more voltage. One thing I really like about LIFE is the way it doesnt loss voltage just sitting around. If you charged it last week its good to go today.Once it becomes more popular it will probably be the standard for receiver packs so yes its good.