The Snap-on CTB8185 18V 4.0Ah Lithium-Ion Battery is a high-quality power tool accessory designed to fit models such as CT9075, 8810, 8815, and 8850. This black battery features a slide-on style and is made with lithium-ion technology for long-lasting power. The 4.0Ah capacity ensures a reliable performance for extended periods, making it an essential tool for various home and garden projects. With the trusted Snap-on brand name, you can be confident in the performance and durability of this battery.