I bought a factory refurbished tab pro 8.4 from Amazon for a week now and the battery life has been great. Tablet is stock with the latest updates from samsung. I do have the Power Saving mode enabled and screen brightness at about 40-45% with auto brightness off. I mostly use the tablet to watch Youtube/Netflix/Crunchyroll (I say about a solid 2-3 hours a day) and usually only have to charge it ever 2.5-3 days. I've been pretty happy with the battery life on this tablet.