Hi, Everyone! Is it possible to replace regular AA (or other) batteries with external DC power supplies (in general) or are there fundamental differences between these two sources of power? For example, my X-Box 360 joysticks (controllers) require two AA batteries each. I have Nokia power adaptor (old), 5V and 890mA. With appropriate voltage divider, I should be able to connect power-carrying wires to the joystick, so it will get 3V. I understand that it will practically immobilize my joystick and make its wireless connection useless, but I did not choose wireless joystick anyway. Also, I know about power kits for X-Box 360, but they include a rechargeable battery, so that solution is applicable for X-Box 360 alone, and does not answer the general question. What happens in case if the joystick (or whatever the load is) draws more current than 890mA? Also, should I be concerned about the waveform of the voltage from Nokia adapter (DC source) and its compatibility with other battery-driven appliances? Thanks to all who reply.