You don't want something that is just "fine at 10A". You want something that is rated for a continuous 10A... or 13A is even better.Hmmm... maybe I haven't thought this through. I was just thinking "in case of emergency". Although the man in the shop said it would be fine at 10 amps.
Just "fine" at 10A means to me occasional and for short periods. A EV will use 10A continuously and for many hours, may be 10 or 12 hours, at a time even when used in an emergency and so it needs to be fully rated for continuous use.
This is very important.