Why is my iPhone battery acting weird?

Okay so I got a new battery put in my iPhone 6 in January and I noticed this morning that it's acting weird and I have been listening to my music a lot on it. Do you think that's why it's acting weird? Please help me do you think updating it to another ios10 would fix the battery? I just hope I didn't do anything bad to my battery and I've heard that iPhone batteries are supposed to last for 2 years

Yes

Batteries last as long as they last. Batteries are like anything, they can fail or develop problems. Since weird is NOT an problem that batteries have, you will need to put in words what the battery is doing?

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