I really would like this idea to work, but there are some issues. Here is a somewhat long winded answer. What would be nice is an adapter that plugs into the cordless tool battery port that can use a 120V power supply. This adapter would need to have a higher current rating than the most demanding power tool. Let’s use the Milwaukee angle grinder for example. I could not find power specs for the M18, but the comparable 7.5Amp corded 4 ½” version runs at 10,000 rpm (M18 does 8500 according to HD) with a max wattage output of 825W. 120V x 7.5A = 900W. Close to the 825W, power loss in the system, rounding up on amperage rating, etc. So for arguments sake, let’s say the cordless version puts out the same power as the corded. 900W/18V=50A. A little more conservative than DR99’s statement that some Milwaukee tools push 40A. An 18V 900W power supply is a large bench top unit that costs a lot more than batteries. If we went with the 40A, it would still be a 720W power supply that I wouldn’t want hanging off the end of my drill. You might be able to use a bench top power supply and run a cord from that, but by the time you have that setup, your batteries will be charged. Batteries can put out high power for short periods of time. The specs for batteries are voltage and amp-hours (Ah). An 18V battery with a 4Ah battery can run at 40A for .1 Hour (6 minutes). Now, why is there dual/hybrid lights and fans? They are low power and could probably run for days, while the grinder is going to die relatively quickly under continuous use. The Ryobi led light is 20W. An 18V 1.2A adapter (20W/18V=1.11A) is about the size of a cell phone charger and could easily be integrated into the internal system. Making an adapter that could work with lower demanding tools is a possibility, but you would have to be careful not to use it on a power hungry tool cause you could start a fire. At least melt the adapter plastic. What company would put out a universal adapter that could start a fire if plugged into the wrong tool. They would have to make a separate port or prongs and at that point it’s not worth it.