New 6P user, battery concerns

Hi all.

I have a refurbished 6P, coming from a Nexus 5. I have some concern about the battery.

Last night it was put down on 95%. Over night on doze, 6 hours, it dropped to 91%. I then used it for about an hour, messaging, a bit of browsing, one very short phone call, and the battery now sits at 74%.

Compared to my Nexus 5, this is to me seems quite heavy loss. Is it normal or should I be investigating further?