2015 macbook pro 15 2.8 i7 R9 M370X on sequoia 15.6

i picked the mac off ebay for about 180$ came with a swollen battery i replaced it but the cycle count has stayed at one and consistently died when the percentage drops below 80% i know this isnt the proper sub t ask but only doing so because we all tinker with our macs and im kinda stumped im thinking the battery replacement is faulty any help would be greatly appreciated :]

submitted by /u/Mean-Substance-2937
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