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Hi there,
Usually phones could be affected by new software versions or Android versions, so the device is trying to adapt to the new system in order to start adopting the operation process and it could take a while. Same for the battery because it is start to operate more things due to the new system.
My words does not mean that this is normal and it should normally happen, but it could happen.
In anyways, sometimes restarting the phone and doing some reset steps after the new software could help in resolving the issue, check the steps here