I bought the Crown several months ago, but I still have the same issue. Battery seems to drain so fast, that I must recharge after 15 - 16 hours! It can't hold for a whole working day and I am not a much talking person. I saw at your Facebook site, that many people have the same problem. I got an answer from the FB Admin saying, that I must ask here.
So, what do you suggest? What shall I do?

Thank you,
Bat.

check your background processes
a lot of background apps use a lot of battery power especially network intensive apps like twitter or facebook, I've also noticed that the wifi uses a lot of battery, if you don't need notification set your wifi to sleep when the screen is off you will save a lot of battery that way, if you really need notifications get the autostarts app from fdroid
https://f-droid.org/repository/browse/?fdid=com.elsdoerfer.android.autostarts
and see what apps start with your device to disable apps you need a rooted phone (you can always uninstall the apps you don't use), you can pm me about info on rooting a crown it's simple but this is not the place to write about it.