Comment just 1 year so far (Score 1) 79
iPhone's 80% Charge Cap Barely Boosts Battery Life in the first year
It's entirely possible that there will be a bigger benefit at the end of the second or third year. Maybe the year-over-year dropoff will be along the lines of 6%, 12%, 18% instead of 6%, 18%, 36%. If your battery is good enough that an 80% charge gets you through the day, it seems there's no reason not to.