Three batteries for my Milwaukee cordless tools.
Earlier this year I bought some Milwaukee cordless tools. For 3 tools, I had 2 small batteries, I got tired of swapping batteries to use all 3. Home depot has been running a sale where you buy X you can get a free tool. One of the things that was offered with a free tool was a starter kit that had 2 larg le batteries, and a charger for $200. One of the offered free tools was a battery of the same size. So I bought the kit, and picked the battery as the freebie. Saved $160.00. I also discovered that when I'm running down the road, I can use my little power inverter to run the charger so I can change the larger batteries in an hour each.