All batteries are tested by sellers prior to orders being shipped. 🔋🔬
If the maximum capacity of the battery is less than 85% then the battery will be replaced with a new battery.
*It is important to note that new OS takes up more memory on devices and requires more battery power to run. Because of this, the battery life on older devices will drain faster throughout the day. So if you're running multiple apps at once like IG, YouTube, Netflix, etc. the battery will drain quicker than you're expecting.*