While using a 40v Ryobi battery in an 18v tool might seem like it's potentially possible, messing around with electricity is ...

The Ryobi 18V One+ 12.0Ah battery is 5.75 inches tall, 5.25 inches long, and 3.5 inches wide, so it's quite a bit bigger than most of the company's other batteries.

In fact, the 18V line, which is the world's largest compatible slide-style battery system according to Makita, offers more than 325 tools.

Steinel is a lesser-known brand that focuses on punching and bending tools and similar accessories. Its MobileHeat MH 7 Cordless Heat Gun is compatible with Bosch 18V batteries and can be used for ...

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.