If you are going to use a Savox servo with a HW 1/8th ESC you may have problems. The HW esc's only have a 3A BEC which isn't really strong enough for 1/8th steering servos, and Savox servos seem to be the most power hungry, with Spektrum receivers most likely to be affected to brown out. I know some people have had issues even on short course trucks with these ESC's causing brown outs.
One solution would be to use a separate BEC, Castle Creations and Yeah Racing are two companies that make them, with many more also available if your prepared to buy online from overseas.
Gens Ace make a good 4S battery, you can get them from Giant Cod in the UK.
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