Pls what can cause draining of batterry, if i parked my isuzu rodeo in the night by 9pm before 8am in the morning the battery has already drained, i bought new battery yesterday the samething happen this morning, what is the problem please

engineer in the house pls i need the screen of techno cc9 camon 12 pro how much and how do i get it i stays in abeokuta although i still the torch but the screen is black out