18650 Power Battery 3.7V

18650 Power Battery 3.7V is a widely used cylindrical lithium-ion rechargeable battery cell named after its physical dimensions (18 mm diameter and 65 mm length). Renowned for its high energy density, long cycle life, and high discharge capability, this battery serves as a core power source for portable electronics, IoT devices, robotics, electric vehicles, power tools, and high-intensity flashlights. It routinely powers single-cell setups or multi-cell battery packs configured in series and parallel.

Features

• Standardized 18650 industrial cylindrical size factor with high energy-to-weight ratio
• 3.7V nominal output voltage delivering stable discharge power under load
• High energy density and minimal self-discharge rate when stored properly
• Supports hundreds to thousands of charge and discharge cycles (typically 500+ cycles)
• Compatible with standard Li-ion charging modules such as TP4056 and BMS boards
• Low internal resistance providing consistent power output for high-drain devices
• Available in flat-top and button-top configurations for diverse holder and spot-welding needs
• Eco-friendly rechargeable technology replacing single-use alkaline batteries

Applications

• High-drain DIY power packs, power banks, and portable battery backup systems
• Robotics platforms, smart cars, motor drivers, and RC vehicles
• Portable IoT sensor nodes, ESP32/ESP8266 remote telemetry, and NodeMCU setups
• Emergency AC/DC lights, LED flashlights, solar lamps, and headlamps
• Power tools, cordless drills, vacuum cleaners, and electric bicycle/scooter battery packs
• Academic, polytechnic diploma, and university engineering thesis electronics projects

Important Notes:

• Always use a dedicated Lithium-Ion charger or a TP4056 module with a properly configured Battery Management System (BMS) to manage charging and discharging.
• Do not overcharge above 4.2V or over-discharge below 2.75V; exceeding these limits can degrade capacity or permanently damage the cell.
• Never short-circuit the positive (+) and negative (-) terminals of the battery, as high current surges can cause extreme heat, fire, or explosion.
• Observe strict polarity when installing into battery holders or connecting to modules; reverse insertion will damage connected electronic circuits.
• Store in a cool, dry place at approximately 50% charge (~3.7V–3.8V) if the battery will remain unused for long periods.
• Do not expose to direct heat, open flames, or temperatures above 60°C, and do not puncture or puncture-weld directly onto the cell without proper spot-welding tools.

Package includes

• 1 x 18650 Rechargeable Li-ion Power Battery 3.7V