I have noticed a few things about my RAZR, Fred. I use more battery on wi-five than on 4g, don't know why. Same sites, same time, over 2 days. On 4g took 5 hours 42minutes to use 20%, on wi-fi took 3 hours 31 minutes. Also Slacker uses less battery than Tunein Pro, haven't tried Pandora yet. Remember these are on my RAZR. Sliced from my skull by a RAZR.