Or you could just do ADB and pm disable <package name> with usb debugging enabled...
With disabled/freezed apps you cannot use them and they disappear from the application menu (still visible in app manager/Titanium backup so you can always re-enable them)
Greenify on the other hand is a little bit different approach. It still lets you use the applications but after that if an app is changing from foreground to background it gets hibernated. With advanced features enabled (donation package required) Greenify allows you to hibernate apps and supports push/wakelocks so even hibernated apps will still wake up when they receive a notification (e.g. Whatsupp message, SMS etc.).
Hope this clears things a little bit. But still - I believe that even freezing/disabling apps won't prevent the battery drainage when the Tablet is fully off -- might be a hardware problem (similar one Similar one I have faced with e.g. Chuwi V17HD) - or - baterry monitoring is sometimes a little bit inaccurate when doing restarts/ shutdowns/startups... It depends on the current voltage of the battery to figure out current battery level... Might be a good idea to install Battery Monitor Widget -- one of the best tools to monitor and check the actual usage of the battery.
Battery calibration would not hurt either. Hope I helped

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