Huawei — honor 7x battery draining issue

Since i updated the my honor 7x bnd al-10 8.0.0.333 to 8.0.0.355. My battery is draining like 3% in 5 minutes. That's ridiculous amount. Before update it used to drain like normal say 1% in 6 to 7 minutes but since i have updated my phone it's draining very fast also the charging speed has slowed. It takes around 4 hours to fully charge. Even when my location and bluetooth is off. I always keep my phone's brightness to minimum still the battery is draining rapidly and it takes way more time than usual to charge. Please solve this issue or else provide me another phone.