I bought the 3000ma chinese battery and it works great but since tweaking my phone enough, I can get a ton of use in my day off the stock battery. I bought an otterbox case which I really like so basically I want to see if an 1800ma battery that will give the extra 20% battery life. I bought a knock-off 1800 one off ebay and it seems to basically be just like the stock 1500ma battery but I didn't mind since it was real cheap and came with an external charger (this was many months ago so im not going to post an ebay link or anything).