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I bought IFIXIT whole battery replacement Kit and successfully replace my MacBook Pro laptop 6 months ago. The Cycle count is only 136 but after fully charged to100%, I can only use it 15 min and it dies after. I can’t seem to use it without plugging the charger the whole time. The “Service Battery “ icon shows on the top status bar. I don’t understand why? I took it to Apple Store they run diagnostic on it and they told to me the battery is not good “I need to replace new battery“. I don’t understand why? does this mean IFIXIT sold me a bad battery? Did any one had similar experience as mine?
Batteries fail, that’s just a fact of life! But luckily you bought it from the right company that gives you a full years warranty. Just contact them and they will send you a new one ;-) https://help.ifixit.com