system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why does my battery stay on 100% for 30 minutes and then as soon as it drops below 100%, start decreasing much more rapidly?
gpt
To make it short, battery percentage is only an estimation. And often, a phone that shows 100% isn't really at 100% of the battery, more like at 95-98% because the charger trick charge it. Staying at 100% is really bad a Lithium battery and the charger "knows" that.