The candles would overheat and light switch on normal house circuit is 110v the candles would overheat and cause fire.
The wiring in the candles would overheat and cause fire.
This is not a good idea. I know what you want to do, but if it runs on batteries then it has it’s own switch and should not be tied into the house wiring. Just do it by hand, one at a time. Sorry to have to tell you this but it is, what it is.
Good luck.