You might be right about that. But when I look at the battery usage on the Hudl 2, it says Android OS is responsible for 52% of the power consumption (screen is 34%, and Wi-Fi 9%), which made me think that the OS might have something to do with it.
-dr_andus
When you look at battery usage stats on an Android device, the Android OS entry is vague and nebulous. It comprises of everything having to do with the Android core OS. However, it also comprises of any tweaks/addons your device OEM has incorporated, and even some third-party apps that may have been installed from the Play store that hook into Android system calls.
Quality of the build, components, and how big of a battery they put in that thing will also play a part in how much time a full charge will last.
Now, I've got a Samsung Galaxy Tab Pro, an 8.4 inch tablet with a screen that sports a 2560x1600 resolution with a 2.3 GHz SnapDragon processor. This is kind of beefy as far as tablets go with power-hungry components, but I can let my tablet sit idle for a few days and easily have battery to play around when I finally get around to picking it up.
Full disclosure, though...I have rooted my tablet and anything that came from the factory I didn't want I've either uninstalled or disabled. I also run Greenify to hibernate apps and Amplify, an XPosed framework module, to limit wake-locks.
This tablet never leaves the house so having to charge it every few days isn't a big deal to me.