Galaxy S4 Battery life

[Labhras]

Hi all, I have a few questions regarding my phone's battery life.
My battery is almost one year old - bought last August. I have Echo lockscreen and Aviate launcher replacing the standard ones - location and power saving on. I use CleanMaster and I barely play any games.
With GSam Battery Monitor I have at least around 30-35% consumed by Android System and around 2hrs of Combined app wakelocks. Kernel (Android OS) is usually around 11-15%.
I have noticed a big drain in battery life from 100 to 70%, then it seems to go slower, and then another bigger drain around 25%.
Is it normal behavior? What about GSam stats? Do I need to recalibrate my battery?
I've been reading about people with 2 days batteries using their phone normally, without having to disable location, sync, etc.

 

[Bosbouer]

For starters dump clean master. Android does a very good job of stopping inactive apps. And if you are actually using cheetah Mobile's clean master, the chances are very good that you have malware on your phone.

 

[Labhras]

What do you mean by malware? I've never heard of clean master defined as malware, some are against it because they see it as a task killer, but I've never seen anything about the app being dangerous.

 

[Bosbouer]

Cheetah Mobile - Wikipedia, the free encyclopedia

Google or search AC forums, you'll find plenty reports of clean master misbehaving.

 

[Labhras]

The only thing that article is saying is that clean master used some scare ads to attract customers - like other software companies do.
If the app is a battery drainer similar to the likes of DU battery saver, or general battery saving/task killer apps, is one thing, but other that those not-so-nice tactics I haven't found anything else about the app being malware/dangerous for the phone.

 

[Labhras]

Besides the clean master issue, what do you think of my other points?

 

[dm3ready]

I would suggest buying a new OEM battery from a reputable vendor or one from Anker (directly). For about $10-15 you can, first, see if your battery is losing its effectiveness and secondly, at worst, you have a spare battery which can be very handy to have.

 

[Labhras]

Besides the new battery, what about the data I posted? Is it "normal" usage?
Because I might buy a new battery, but if there is another problem - i.e. wakelocks, draining from apps or the OS, etc - the new battery won't change much.