Product Description The PKcell 18650 Unprotected Battery is a powerful lithium-ion cell designed for advanced users who need compact, high-capacity energy solutions. Without a built-in protection circuit, it provides slightly higher current output and energy density, ideal for battery packs and controlled circuit systems. Users should handle it with care and use it only in systems equipped with appropriate protection circuitry. Features  High discharge current and energy capacity Suitable for assembling custom battery packs Low internal resistance for efficient power transfer Long recharge cycle life and excellent performance Compact and lightweight design Applications  Medical devices, Energy Storage, Power Tools, Electric Vehicles & Mobility Battery pack assembly for RC models or robotics Powering custom electronic circuits Suitable for devices with built-in battery management systems (BMS) Research, prototyping, and testing applications