Question: Should I limit my Galaxy to 80%, or is it a waste of battery?
A
Answer: Yes, for most people who keep a Galaxy for three years or more, or who leave it plugged in for hours at a desk or overnight. Capping the charge at 80% keeps the battery out of the high-voltage zone that wears lithium-ion fastest, and the cost is about a fifth less runtime each day. If you trade in every two years or need every last percent by evening, leave it on Basic, or use Sleep time protection so the phone still hits 100% by morning.