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You could solder, or otherwise attach the power supply to the points determined in Step 2, or like I do in my example, I fit a plug to the power supply and a jack to the toy. The first thing to check is how the batteries are wired and find the beginning and end of where the energy flows.g. 1N4148) in series will drop about 2V at the low current the mouse likely draws (a few mA), so that should work for you. If I replace my batteries with a power supply of equal voltage, then the current in the system also stays the same. Now find a power supply that supplies the needed voltage you measured and has a high enough current rating that you won’t burn it up with your device’s amp draw.