The battery life is another strong aspect of the Dell Venue 8 7840.
While Dell did not release an official battery capacity for the Venue 8, CPU-Z puts it at around the 5500 mAh mark, which sounds about right.
Either way, the battery performs admirably. We used our sample regularly – with WiFi, sync and auto-brightness enabled – and the Venue 8 made it through 2 days before needing a recharge.
Obviously, depending on what you're doing, the device will last varying amounts of time. But for most consumers, however, a 2 day battery life is probably accurate. This is based upon watching videos, playing games, and surfing the web at regular intervals.
So if you want a device you can depend on to use solidly throughout the day, look no further.