We now have the confirmation of one of the earliest Galaxy Note 9 rumours. It has been rumoured that the device’s battery will allow it a 25-hours of continuous video playback with maximum brightness. Well, it looks like this may be true. A filing with the National Telecommunications Agency ANATEL in Brazil reveals that that the Galaxy Note 9 will feature a 4000mAh battery. This is a huge step forward when compared to Galaxy S9’s mere 3000mAh.