This product is a lithium-ion battery for hookah devices from the Efest brand. Designed to power hookahs that use vaping cartridges, the li-ion battery has a capacity of 2500 mAh and generates a charge of 35 A. Each battery comes in a bright purple colour, measures 2 cm tall, weighs 0.11 lbs, and is classified as an IMR high drain product, meaning that it is ideal to use in vaping devices.