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Device idle battery drain

Hi, any help wud be appreciated. I have a samsung A3 2016 on android 6. Ive gone thru all the suggestions to improve battery drain and thought i had it cracked, i was getting very little drain whilst the phone was on idle. However overnite lastnight the battery drained by 20%, most of which was 'idle'. What i dont get is i turn location off, do not disturb on, power saving mode and flight mode on. So how can anything be draining it in idle if all connections to networks are off? I dont understand why its changed again...
 
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