I haven’t really tried the full battery life under Android (it runs smooth, and the battery drain is pretty low), but under Windows on 40% brightness I can watch videos / browse the net on wifi for like 8.5+ hours, and everything’s smooth, even the 30 fps 4K videos – which means I like my A6C9 a lot! :))
I don’t use 3G – I assume it drains the battery a bit more than wifi -, plus I always switch my tablet off instead of letting it going into standby, when I’m not using it for hours.
BTW, the firmware is the latest – you can upgrade it via Device Manager -> Firmware -> System Firmware, then it’ll show Teclast System Firmware. The upgrade process will take a while, and it’s pretty creepy, but after like 3 restarts things will get sorted out, and everyhing will be fine.
Give this a try – if it doesn’t help, maybe your battery is faulty.
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