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I replaced my battery (Macbook Pro 13inch early 2015) with ifixit about a year ago. Now it only can be charged to 15% of capacity (1046mAh instead of 6559mAh). There are 371 charge cycles. Am I doing something wrong? Should I expect a better life from a replacement battery? Any suggestions other than buy another battery??

Yes your battery is not doing well, contact the store for a replacement Contact iFixit Customer Support