it depends on your usage, as you know, there are only limit # of recharge cycles you can do with a battery. When it goes, you have to replace the battery or power it with a docking station. Yes, external USB battery pack would work(and I got one when I got my A605, and I continue use the pack on my N900 too). But it is sort of messy, I look geeky already, I don't need this extra thing to enhance that look...