One thing to look out for when choosing an esc for 1/8th electric is that most only have a 3A BEC which can struggle to power a half decent servo. The Tekin RX8 has a 5A and the LRP iX8 has a 6A BEC that showed be more than enough.
If you do get an esc with with only a 3A BEC there are ways around the issue like using a separate BEC, or using a high voltage servo and then wiring the power side of the servo up directly to one of the Lipo's but this could give a small issue of one pack being discharged slightly more so could take longer to balance. Both of these will also result in a less tidy install off course.
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