Sony Xperia XA2 Ultra battery drain

you can try an app like crest, to figure out how many background apps using cpu. I would suggest to turn off mobile data and wifi and try it again. I have the Plus version with the same battery and I had the same "problem". it was caused by a weak 4G signal. the phone was switching between 3G and 4G. the search for network consumes a lot of battery even in Stand-by mode. Cheers

A smartphone connected to mobile network ("standby") lasting for about four days seems reasonable.

Apart from that, actual power consumption depends on signal strength of mobile network and WiFi, as well as running background apps like messangers and email synchronization.

The behaviour you describe does not indicate any app running amok, consuming CPU and battery. Nothing to worry about.

@ziellos I disagree. It's too much. my plus consumes 15% the same time only. and 30% within 10 hours of heavy usage including Android services, 30 mins online navigation, 2 calls, 45 mins of reading and many chat messages

Without knowing the actual conditions, it's pure gambling. At least we need to know what networks are used, what apps are running (native and Android), what accounts are configured, and what SIM card(s) are used.

Again, I would be happy with four days of standby time.

@JIMARAS, you can try to change governor and minimal CPU's frequerence for decreasing battery consumption.