I bought a new cellphone few months ago, but after a month, I noticed whenever I charge it at night, the next day when I wake up, the battery says It's low, even though it was fully charged that night and didn't use. Anyone knows why it happens?

Sounds like you may have gotten a bad battery. Since it is new it should be under warranty. Take it back and let them look at it.

Sounds like you may have gotten a bad battery. Since it is new it should be under warranty. Take it back and let them look at it.
Alrighty. Thank you~