Well done, nice write up, looks like you had a great time at the event! I am intrigued by what the next machine is going to be, I'll be sure to keep an eye out for that.
I am gutted I wasn't there for this one to see your bot in action, I had Azriel running for this and all. :( Anyway, well done on your first event!
Yup, I'd go for this. 14.8v over 11.1v...
We've just stocked FingerTech's Metric NutStrip and Twist Hubs/wheels! No more importing from Canada :)
https://shop.bristolbotbuilders.com/product/nutstrip/
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The rules say a LiPo battery must be fitted with a fuse that is rated below the burst discharge rating of the battery (rule 7.8.3 of the current 2018 rules).
So 3.3aH * 150C = 495 amps, which is...
I doubt it. So long as the battery meets the rules, you should be OK. Sounds like they may have changed how the batteries are made but otherwise they should be OK. Got a link handy as to what you are...