Anybody carried power extension strip, 4g router and BT speaker (none of them have batteries) in in-flight baggage? Does security allow?

I have traveled with BT speaker. It is allowed. 4G router should be allowed according to this - https://www.goindigo.in/baggage/dangerous-goods-policy.html Check with your airline to be sure.

@lemon-knife-94497 thanks. Asked spicejet. They said it's allowed.