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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.
Just a note about 16GB + SD card with KitKat: in my experience with the Galaxy Tab S 8.4, that’s quite useless. I guess it depends on use, but a 2.5GB game can only move 100MB to the SD card, and most apps can only access the SD card read-only. So even though I have a 64GB microSD card, it gets next to no use, while the device storage is always full. So this Dell may be able to use a 512GB card, but it’s pretty pointless.
By the way, it would be interesting to compare this to the Galaxy Tab S 8.4.