Every cordless tool brand charges an unspoken fee: a charger that only works with its own batteries. I've paid that fee for years on the Ryobi side, which is why Ryobi merging its 18V and 40V charging into one unit caught my attention. Milwaukee pushed the idea further with its M18 TOP-OFF Charger & Power Supply. It's a half-pound adapter that snaps onto any M18 battery and adds a USB-C port that works in both directions. Feed it from the brick already charging your laptop, and the pack fills. Pull the brick, and the pack starts feeding your phone instead. Milwaukee's red bench charger can stay in the garage.