2 cell? 1/8th? Oh - looking for efficiency there then! The complete Castle System is around £230 ish in the UK, but easily impoted for nearer £160. Not to mention that its value should be higher as it is simply better.
Where you're saying that the MP7.5 is the car of choice for RTRs because it suffers lots of abuse, does that mean the more recent designs are weak?
Not a lot you can do waterproofing wise though - bar running the ESC in a self contained 'oil bath'.
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