The Xtar 21700 3.6V rechargeable lithium-ion battery delivers exceptional power and endurance, making it ideal for high-drain devices such as tactical LED flashlights. With a high capacity of 5000mAh and a continuous discharge rating of 25A, this protected cell ensures long runtime and reliable output. Designed with advanced safety features and built to withstand repeated use, it supports over 500 recharge cycles—perfect for professional and heavy-duty applications. Key Features: High capacity 5000mAh for extended usage time Supports high current drain up to 25A continuous Protected cell with built-in safety circuit Advanced safety features: Overcharge protection Over-discharge protection Short circuit protection Over current protection Over voltage protection Explosion-proof valve for added safety High-performance core for stable output Gold-plated protection board for improved conductivity and heat resistance Button Top design ensures wide device compatibility Specifications: Nominal Capacity: 5000mAh Nominal Voltage: 3.6V Discharge End Voltage: 2.5V Max Continuous Discharge Current: 25A Standard Charging Voltage: 4.2±0.03V Standard Charging Current: 2500mA Transport Voltage: 3.6~3.9V Over Current Protection: 25.5~35A Operating Temperature: -20~50°C Storage Temperature: -20~50°C (Best at 25±5°C) Internal Resistance: ≤23mΩ Recharge Cycles: Over 500 Protected: Yes Positive Terminal: Button Top Common Uses: Tactical and LED Flashlights: Powers high-intensity lighting tools for professional use such as Xtar and Fenix. Outdoor Equipment: Suitable for compatible camping lanterns, headlamps, and survival gear. High-Performance Electronics: Ideal for high-drain devices that demand consistent output. Power tools: Used in power tool battey packs which require reliable protected cells. This cell is a protected cell and and has a protruding button-top terminal. It is around 2.5mm longer than an unprotected cell. Please check if your device requires a protected or unprotected cell before purchasing. Export Information Commodity/Tariff Code - 85076000 Country of Origin -China (CN)