VERY heavy usage. I get a lot of use out of my phone. I lifeguard and when the pool is dead (which is very often) i use my iphone constantly. I also use mywi for tethering to ipad occasionally, but i have no other jailbreak modification. I jailbreak strictly for mywi. I've abused the hell out of this battery. I will be replacing it soon though so we shall see how the new battery compares. I won't be getting the iphone 5 right away. For two reasons, one is that i will wait for a full untethered jailbreak for it, and the second is i want to let me att contract run out so i can switch to verizon. Also, my sister works for verizon so i will be getting a good discount on my plan, for that reason it will be a few months before i can obtain the iphone 5 from verizon because if your plan is discounted you have to wait a bit for new releases. So ill be keeping my iphone 4 until around march.