It looks like I have 10 Ryobi ONE+ batteries now, but one is only 1.5Ah. The rest are all 2Ah and 4Ah. The small one is only good for use in my drill, because I don't drill a lot of stuff at a time. If I need to do heavier work I plug in the 3/8" corded drill. I don't use the 1/2" drill very often, because it's so big and slow. I have one charger that sets on top of the battery and it's good enough for the 1.5 Ah. The other batteries clip into the other 4 chargers. I can put 2 2Ah batteries on their sides in each of the biscotti tubs, and lay a 2Ah and 4Ah battery on their sides on top, but can't quite get 2 of the 4Ah batteries to fit that way. I have a 4Ah battery in my vacuum, but need to empty another tub for a couple other batteries. I gave my friend a couple dozen of these tubs and he has them stacked up in his garage to store stuff in.