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Help typical overnight battery consumption?

So I bought an infocus m560 (refrain from the Chinese crap comments) my only issue with it is that thee battery drains over night and I have no idea why.

Examples:
Drained 10% over night (11.30pm-7am)

Drained 10% (46% to 36%) between 11.30pm and 7.30am while I was asleep.
It dropped a further 3% between 7.30 And 10am.

In both cases :
The screen was off, I used purify to clean the system and cleared all running tasks. I had Wi-Fi and data off and had received no calls or texts that meant to led notification was flashing.... Why did it drop so much when not even being used?
Under battery I checked and the biggest consumer is "phone idle" not screen as most other phones show.
Expect being rooted (kingroot) and having titanium backup and purify installed, I have the phone set up in exacttly the same way as my other phones (p8 lite and xperia z) and none of them drop during the night more than 3% ... Even my previously ownded zenfone 5 which had a horribly poor battery when being used.
Anyone know how I can fix this or what's causing it or how to go about improving it?

I just can't determine what's running that's causing the battery to draain.
I don't have power saving mode on because all the options it has to switch things off I already set to off anyway.
Really hope someone has any idea or has anyone experienced a similar problem?
 
Maybe the phone radio aerial is not so good and it's using a lot of power - especially if you have a poor signal. Try it overnight in airplane mode and see if it is better.
 
I don't see anything wrong with the battery drain. It's a little over 1% per hour at night.

Remember this is a crap chinese phone we're talking about here.
 
It seems to be picking the signal up fine. I don't want to turn it off or out to aeroplane mode invade someone needs to phone me in an emergency.

What is the best way to clear cache? I have purify installed but people saying its not trusted. I want to be able to save battery.
Just confused as none of my other phones drain as much when not in use.... Also I don't understand what is consuming the battery
 
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