So today, our family was coming back from Phoenix to visit relatives, driving 11 hours to Bay Area, CA. I started out at 47% battery, set it to airplane mode, listened to music and watched videos the whole way, then weaving through LA, we got lost. Pulled out the PB and we rerouted with the Maps app, just got back home a couple hours ago, and still have 8% left. This is seriously the best...!!
You're in good company! BTW, you said new. If that's the case, the battery life will improve somewhat after its been through a few cycles.
I expect it to, it was on its second charge. The first one I ran down to zero and recharged, I will do it 2 times, like that, and then charge normally when it hits low.