Question Regarding battery life

Jun 23, 2020
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about 4 months ago i bought a new battery for my laptop, it always used a lot of battery and it's very old which makes it worse but i was able to easily get to 2 hours of usage and now the battery can barely last 1 hour and i want to know if it's possible for it to degrade so quickly or if the battery is actually bad since it's still under warranty