I just replaced my IPhone 5 battery that is a year old and will not last more than 3 hours of use. Hopefully this is a quality replacement battery that I bought from ifixit. It costed more than other batteries so I hope it really is a good one. One word of advice, after turning on phone for first time after doing this guide the battery was so low it had to wait 10 mins before turning on but the scary thing was there was no signal, it said "searching" until I turned the phone off and turned it back on and then everything worked fine again!!! Phew!! I really hope this battery works better than other replacements I've had for older iPhones like 3 and 4s, they were worse than the worn out OEM!!!