The newer Xperia line is claiming multi day battery life because they aren’t using 4K displays on their highest end models anymore. Their Xperia 1 V was their last model with 4K if you wanted that for watching movies or something. I believe the Xperia 10 devices have always had reasonable battery life, comparable to other phones in a similar form factor (6.1" to 6.3" I think)
The newer Xperia line is claiming multi day battery life because they aren’t using 4K displays on their highest end models anymore. Their Xperia 1 V was their last model with 4K if you wanted that for watching movies or something. I believe the Xperia 10 devices have always had reasonable battery life, comparable to other phones in a similar form factor (6.1" to 6.3" I think)