definitely can. But it really depends on your usage, some people said that they only get 4~5 hours. Similar to my old surface pro, people say they only get 3~4 hours, but i usually use up to 7~8 hours. Turn of bluetooth, brightness low will actually help a lot.

No gaming, no windows update, use edge for browser sure can

The batt last how long actually depends on ur usage..even a laptop I believe will have the same situation,another thing what do u wanna do with ur so call replacement laptop?for work or for show off etc it all depends on one self.for example i buy surface pro bcoz i wanna replace it with my notes and also my planner and i have a lot of sketches to take along so it can replace all those heavy paper n books .

Finally spent a day with my SP4. Here's my report on the battery.
It took me 2 hours to charge full 100%, around 2pm was fully charged for me.
I started using it to watch youtube for around 40 minutes while browsing other stuff, then I tried Steam In Home Streaming Fallout 4 and Rayman Legends for around 20 minutes. I downloaded a few games in steam that took me around 2 ~ 3 hours+. I then played some games for awhile, browsing stuff and just doing casual stuff. From fully charged 2pm, I used it until around 3am midnight, with the mixture of brightness low and power saving mode. Of course in between the 13 hours I got rest for awhile.

We have stock for sp4 i5 256gb 8gb ram model.

Gosh...everywhere in senq out of stock for 128gb....=_=

Thank you for fast reply.

Now doing the updates, hopefully it solved. Before update, there is only a power plan to pick which is balanced.