After getting stuck with no power during Hurricane Sandy (and having my stupid Bionic lose battery when I needed it most), I've decided to get an extra battery. Right now I've got the stock battery. I definitely do not want to get a full extended battery (don't want the extra weight/size). I can either get an extra stock battery, or a Mugen extended battery. Anyone have any experience with the mugen? It seems very expensive for a minimal increase in capacity. Also, does anyone use a charging dock that they can recommend (so that I can have one charging while the other one is in use)?