Adnan Ahmed/SlashGear Every year we feel like we’ve reached peak smartphone, and yet, we continue to receive phones with better cameras, faster processors, and screens that bend in half. New chips bring not just performance gains but also better efficiency. Pair that with small, but appreciable improvements in battery capacity, and these powerhouses still manage to last a full day. Batteries degrade, though, and with all the processing our phones do in the background, it’s very commo...