Battery drain so fast

I got my ipad pro 12 m2 6 months ago but the battery is draining so fast..this happened Aug 10. As per apple support there is no problem with my battery but i know there is something wrong..before i can use my ipad for 2 days before i charge and now it is not even 12 hours it needs ro be charged. Even if not using the battery is draining so fast..i need to turn off my ipad before bed time otherwise it will be dead the time i woke up…Now i need to go to to a repair tech and travel 5 hrs back and forth for this..this is a nightmare and i am afraid of upgrading my apple devices because this might happen to my new devices too..and what if the apple repair tech will tell me i have to pay to fix the battery when this is apple issue and this is ony 6 month old..just wanted to bring my dissapoitment and hopefully ig gets fixed. I plan to go to apple repair center next week..