Ryobi currently makes four different types of battery systems: USB Lithium, 18V One+, 40V, and 80V. Each of these offers different power outputs, making them ideal for different kinds of tools.

The 18V ONE+ Charger, Fast Charger, and 8A Rapid Charger are the most basic battery chargers in the line, each able to handle one battery at a time. They also have identical LED indicator lights.

Ryobi does, in fact, manufacture several different chargers for its 18V power sources, and often even includes one with many device kits that come with a battery pack. Apart from those standard ...

Both the regular charger and the fast charger can juice up any Ryobi One+ Lithium battery, no matter the amperage. However, 18V One+ batteries are the only batteries that they are rated to work with.

Its One+ 18V batteries are compatible with nearly 300 different cordless tools and devices. Right now at Home Depot, you can get two 18V 4Ah, a charger, and a power tool of your choice for $99.