Making any judgments like this on battery life after a single day or even a few days of use is VERY unwise.
The main reason is that your system needs to index your entire drive; this will require MUCH more power than typical power use until this process is complete. Should give a new system at least a week to shake out before freaking out about battery life.
I've also noticed the battery life is quite bad. My first one might have been defective as it only gave about 3 hours of battery life (from the in computer estimate), which is the same as my 4 year old 2012 macbook pro.
Second 13" touch bar machine now reports about 5 hours, which is still not great.
The main reason is that your system needs to index your entire drive; this will require MUCH more power than typical power use until this process is complete. Should give a new system at least a week to shake out before freaking out about battery life.