I bought a car off eBay and it came with a 3S LiPo Venom 4000 20c. It does not sit flat on a table like my 2S Lipos do. It seems to have some curves. Is that normal for a 3S? Also I ran it until it was dead - wouldn’t turn the car wheels anymore. I charged it back up and my charger said it received 1,687. Are these signs the thing is bad?