The AolsteCell AA-PBTN4LR 4-Cell Laptop Battery is a high-quality battery designed specifically for Samsung Notebook 9 Pro models, including NP940X3M, NP940X5M, and NP940X5N. With a capacity of 54Wh and a voltage of 15.4V, this battery provides reliable power for your laptop while ensuring optimal performance. Compatible with various Samsung models, such as NP850XBC and NT930SBE, this battery is a versatile and efficient accessory for keeping your device powered up and ready for use.