am I able to bring cologne, power bank of 20 000mah,gum, cream, or normal aa batteries?

Yes, you can bring the perfume. According to the regulation, the liquids should be less than 100ml each bottle. The power bank and battery are only allowed to be put in the hand luggage and it should be no more than 20,000mAh. The battery more than 160wh is not allowed. Besides, cream and gum are allowed to bring. Don't worry.