In my standardbatterytest, where I play videos back to back with the screen at 75% brightness and both Wi-Fi and cellular connections turned on, the Tablet P lasted just 5 hours and 16 minutes, about half the battery life of an iPad.
Our standardbattery rundown test involves setting the brightness and volume to half, using 4G in a 75 percent or better signal area, enabling GPS and WiFi (not connected) and disabling Bluetooth while looping a video from a full charge until the battery is drained.