i recommend to enable then disable bluetooth after boot because of bluebinder bug
do not let drain battery until Xperia V die for no power - it happens when battery voltage drops to 3V what it not good for battery life. use battInfo app for Xperia V to check actual voltage or approx percentage so you will know when to start charging
Xperia V: some calls, xmpp chat, music, mobile data (4G,5G), wifi at home, some web browsing, charging 1x 2-3days