I just got a store demo unit macbook pro 2015, barely a year old but the battery is making me wonder. On a full charge running lightroom with 4000+ photos, i think i got around just over an hour or two of battery life. Is my battery drain normal for an app that heavy? or should i get this returned to the store? I have a 3 month store warranty so i'm still well within that window if i need to get it exchanged.