[Windows 8 General] sence:
I think the battery of X80H is a 5V 5000mAh one.......I will explain various mWh readings I got of this tablet....First time when I got the tablet I charged it for 8 hours and started using the tablet...When it got to 7%, the reading stopped and stayed like that for more than 2 hours....The situation was same for android and windows....At that time I installed HWMonitor and found out the battery capacity is just 14432mWh...Then I charged it full....Situation remained unchanged..Then I decided to go with the 0% discharge technique....So I played couple of games in android and managed to take the battery to 4%...When I tried to restart, the tablet wont turn on...It was only showing that battery icon...So I connected the charger and kept it till it switches on.....At around 6% tablet booted up...So I removed the charger and got into windows...When I checked HWmonitor, it was reporting 16332mWh....So I thought it got calibrated...But I noticed HWmonitor was reporting the battery voltage as 4.3V(it was the first time I looked at the voltage,prior to that I thought the battery is a 3.7V one)... Then I thought it should be like 4.3V X 5000mAh = 21500mWh....So I decided to make the tablet discharge completely by changing the critical battery action to do nothing......Since I was already at 6% battery I thought it will go OFF in no time...But, it got stuck again at 4% for about half an hour and again stuck at 0% for about 15-20 mins....All these time I was playing videos on windows from SD card (sandisk Class 10 64GB formatted NTFS, to my surprise this same card works perfectly on andorid...I dint think android ROM would read the NTFS FS without moding), WIFI was OFF.....After the tablet shuts down, I made sure that no charge left in the battery by pressing the power button, and power butt + volume keys combo....Though it dint even show the teclast logo or battery icon....After that I connected the charger and I pressed the power button,it dint show any sign of turning ON (I know the trick was to not switch ON the tablet,but I just wanna make sure I dint destroy the tablet :laugh: )...After 1 min I pressed the power button again the teclast logo appeared and then the low battery icon....So I kept the tablet connected to charger for 8Hours....Btw the charger I used is the one from XIAOMI - 5V2A out.

After 8 hours I booted up the tablet and got into windows....The time showed a 30 mins difference but to my surprise the HWMonitor reported a whopping 24082mWh. and the voltage was 4.3V....Also it took a lot of time to go from 99% to 98% and to 97% (WIFI was ON and I did some browsing)...It was the same rate as my ACER ICONIA W4 discharges (which gives me around 8.5hours of runtime on windows)..At 97% I decided to check if the calibration goes off if I boot into android....So I rebooted and boot into android...On android also, it took a lot of time to go from 97% to 96%....Then I decided to go back to windows and the HWMontior reported same 24082mWh and voltage 4.17V...I was so happy....Then I turned OFF the tablet,had to go out....When I got back I turned ON the tablet and got into windows...But all hell broke loose again, HWmonitor again reported the first reading, 14432mWh , 4.171V...Though battery percentage was the same 96%...But it went from 96 to 95 really fast....Just the same as the first time...Now it is at 80%...I noticed the battery voltage changes from 3.7V-4.3V during 2 or 3 reboots....Anyway I think the tablet has got a 5V 5000mAh battery which can do a run time of about 5-6.5 hours on windows....Also dont forget , like on 7% the tablet will get stuck at 4% and 0%, atleast for me....Hope teclast will roll out an update to tackle this issue....

Also do you guys recommend to install battery calibration tool on android? 'cause I saw some one complaining about the android battery calibration messes up the charging of the tablet...