i havent read through the whole thread, but my comments regarding the nano techs would be they are a great performing battery - not as good as my thunder powers or HPI Plazma's but more than enough for club racing. However, i have found the casing to be of pretty poor standard, and all but one i have owned have cracked during crashes or impacts in one way or another.
I don't necessarily think this deems them dangerous. All i have done is tape them up with electrical tape. I simply wouldn't use them again if i thought they were dangerous, and i am very selective in what car they are now used based on protection etc.
However, i can see how the quality and thickness of the casing could be a reason for them not being approved.
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Stephen Smith
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