How do I know if the Avail is charging? I've been having trouble with my phone and am trying to determine if it is the battery or the charger jack. I just put a brand new, uncharged battery in. At first, an animation of a battery charging showed up on the screen, but after about 10 seconds, it went blank. The back key (bottom right) is red. Is that a charging indicator? Is there any way to know when it is fully charged, other than to turn it on and check the battery indicator icon?