Wondering if anyone has tried and had luck with an aftermarket battery. I've got juice defender installed, I keep my brightness down, I turn off GPS, etc., etc., but I still lose 40% charge from about 1AM to 10AM while I'm sleeping. I even have the advanced Juice Defender that's supposed to make things turn off during those hours (except alarm clock). I've got the battery calibration app, monitors, etc., tried it all. Battery life is still less than optimal. So... I thought about getting a better battery. I was hoping to find a higher capicity battery, but they all seem to be 1500mAh. Anker says it can offer up to a 25% longer battery life. They're $16 shipped on eBay. Thoughts?