I'm referring to the ability to hold battery capacity. Yes battery wear over time. And it's a general guideline that after 500 cycles, it's typical to have 80% of the original capacity. I've just broke 500 cycles on my launch day iPhone 5. Current capacity is only at 1050mAh. While my launch day iPhone 4 with over 700 cycles, it's current capacity is still at 1375mAh. There's an alarming number of other users on MacRumors with similar battery capacities. Lets see 5s and 5c users in a year and a half time.
Agreed. I have had a 3G, a 4 and a 5, and overall have been least happy with the 5. Obviously it's a very fast, light phone with a beautiful screen, but the battery life was, at best, marginal to begin with, and it has gotten markedly worse over time. Actually it might be my least favorite Apple product I've owned (and I have owned 4 Macs, many iPods, 3 iPhones and 3 iPads). I really look forward to getting a 6.