What's your main charge lead you use? I use xt60 with adapters. I recently took the plunge and went *off brand" and purchased some ovonics. 3s 5000, $32 a piece. And they fit directly and perfectly in a trxxas battery tray to my knowledge. Both my hoss and slash 2wd, perfect fit.
I purchased extra adapters from Amazon as well. Although I have venoms with the adapters. So far I've had no issues and for the price i couldn't be happier.
https://www.amazon.com/dp/B07L6C7BX9?ref=ppx_pop_mob_ap_share
https://www.amazon.com/dp/B07NR54JC1?ref=ppx_pop_mob_ap_share