Definitely true. I've seen temperatures in my tests on EC5 connectors over 200F and the most Amperage I'm pulling on average through a full discharge is about 85-90A. Thats why it cracks me up when I buy a 5000+mAh LiPo that claims to be 100+C and it comes with 12AWG leadsI can't do the math to back it up but I fully believe that just based on my wiring experience. Even a 6" run of 10 gauge with a 90amp rated connector on it would get hot very quickly if you tried to push the over 200amps many of these batteries claim to be able to produce through it.
I use the same packs in my bashers as my crawlers so they are all rated for the bashers. Sometimes I won't use a pack when I'm out crawling so I come home and throw it in the Vorteks. I will just do some rips up and down the street until it hit's LVC which takes about 10 minutes max on a 5200 pack.
I do know that when I dump a battery through the truck like that the wiring and connectors definitely warm up a bit.
Great article and the video they have in that article is also quite interesting.Thanks for sharing that example, I found an article here which might help explain why you're seeing the extra mass:
https://www.smc-racing.com/index.php?route=product/category&path=174_175
Have you given any thought to trying some of the higher end "budget" batteries like Liperior, CNHL G+, Regular Turnigy, or Zippy Compact as a possible replacement for the Zeee packs? I get that performance isnt as critical in the class where you use these, and they are anywhere from 50-100% more expensive than the Zeee packs, but no where near the price of Trinity batteries. Just curious.When it comes to open mod classes then I'll pinch my pennies with Zeee packs which tend to last about 2/3 as long as TWC but are priced close to 1/3 as much making them more cost effective even though they don't perform as well nor last as long.