My device is 2 years old, Accubattery claims 70% battery health, but I still get 6h+ SOT on a single charge since recently updating to Android 13 (SparkOS). Device is Redmi Note 10 Pro.
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Replace it when your daily battery life starts becoming unacceptable or if the battery itself starts swelling.
Like everyone else said, replace it when it becomes a problem for you. Don’t worry about the %life left, or how full you charge it. (IE some people try to keep it around 80% to extend the life of the battery)
Your phone is a tool, use it as such and replace parts when they become a problem. I’m still using a Pixel 3 which I’ll upgrade later for security/updates.