I have the QHD and am getting around 6-7 hours battery life for web surfing.
the worst battery ever my friend!
it is the first and the last time that I am using a Dell laptop. I bought XPS 13 9350 and the battery lasts at most 4 hours just serfing on the internet.
My FHD 9350 laptop lasts about 2.5-3 hours of real world usage (surfing, watching videos on Youtube and Twitch).
I suggest you purchase one high capacity battery if it is better?Look at here:
the capacity is the same i think ...Capacity: 52Wh
Not really,the 90V7W battery is 56wh,it is suitable for 13 9350 too,it is about 7000mAh