Rechargeable Li‑Ion Battery Panasonic NCR18650B 3400 mAh 3.7 V — 18650 Cell

Panasonic NCR18650B is a single rechargeable 18650 lithium‑ion cell with a nominal capacity of 3400 mAh and a nominal voltage of 3.7 V. The cell is designed to deliver extended runtime per charge and stable voltage output for high‑capacity applications such as flashlights, power banks, portable electronics and DIY battery packs. As a cylindrical 18650 format battery it fits standard holders and battery management systems that accept this cell size.

Advantages

The NCR18650B offers high nominal capacity and consistent discharge characteristics for devices that require longer continuous operation. Its chemistry provides relatively low self‑discharge when stored and a stable voltage under moderate loads, helping preserve device performance between charges. The cell’s uniform cylindrical form factor and compatibility with common 18650 holders simplify integration into custom battery packs and replacement applications.

Suitable for

• High‑drain flashlights and headlamps
• Portable power banks and USB battery packs
• Portable electronics such as radios, GPS units and cameras
• DIY battery packs for e‑bikes, tools and hobby projects (with proper BMS)

Key specifications

• Cell type: rechargeable lithium‑ion (18650 cylindrical cell)
• Nominal capacity: 3400 mAh
• Nominal voltage: 3.7 V
• Typical full charge voltage: approx. 4.2 V
• Recommended charge method: constant current / constant voltage (CC/CV)
• Typical dimensions: 18 mm diameter × 65 mm length (standard 18650 size)
• Typical weight range: standard for 18650 high‑capacity cells

How to use

Use the Panasonic NCR18650B in devices and holders designed for 18650 lithium‑ion cells. Charge the cell with a compatible lithium‑ion charger that implements CC/CV charging up to the recommended maximum charge voltage and monitors current and time. Install cells with correct polarity and ensure good contact in holders or spot‑welded assemblies. For multi‑cell battery packs, use an appropriate battery management system (BMS) to provide cell balancing, overcharge, overdischarge and overcurrent protection.

Recommendations

Store cells in a cool, dry place and avoid exposure to high temperatures. Do not puncture, short‑circuit or expose the cell to fire. Follow charger and device manufacturer instructions and use protective circuitry for multi‑cell assemblies. For long‑term storage, keep the cell partially charged (around 30–60%) and check periodically.