Please reaolve this issue samsung

j7 2016 has been added to the list of phones getting oreo update

it has removed many useful features like1)volte for jio users2)removed the feature of storage change of whatsap and messanger to memorycard.it was a very useful feature because internal memory gets very low due to whatsapp videos or pics.3)bike s mod...

I have j7 2017.After updating to nougat its taking very long time to charge the battery.Even my friends having the same phone are facing the same issue.Please solve the issue in next update.