You're allowed to take liquids acquired after security, that are exactly what they are supposed to be, liquids for human consumption.

What they don't want is people taking liquids that aren't designed for human consumption.

As for the phone battery issue, yeah it is a problem, I guess the only solution would be to forbid any kind of battery powered device.

I bet lots of folks won't be happy with such regulation.

It would take care of flights for business purposes and increase selling books though.