OK so I have read and followed almost every threat religiously about how to extend the battery life on my HTC Evo. I still get the drop from 100% to 90% within minutes of taking it off the wall charger (stock charger). SOME days it will work for hours and never drop past 85% and some days it will drop to 40% by the end of three hours. I have ordered the Gorilla Battery 3500 and hopefully this will help, but it will reduce my Premium case to worthless. Any ideas what the heck is going on with this battery issue and why it hasn't been resolved ?