The Molicel P42A 21700 battery has a nominal capacity of 4200mAh and a continuous discharge rating of 45A. It is suitable for high-drain applications and compatible with 21700 devices. The battery features a flat top design and is rechargeable, with a nominal voltage of 3.6v. It is not protected and has approximate dimensions of 21.40mm x 70.00mm, weighing approximately 67.8g.