my Motorola backflip Battery doesn't last well i don't know why it last like a day?

i barely used it today i charged it at 530 and now it is 9 and it is at 80 percent and i didn't even use it i sent like 5 texts and that's it i just got it tuesday why doesn't it last long when i got it i started using it and i did not charge it to later and Battery was at 20
 
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