Key Features

• 4000mAh Capacity: Provides long-lasting power between charges for high-demand devices.
• 30A High-Drain Output: Delivers strong, steady current for demanding applications.
• Flat-Top Lithium-Ion Cell: Designed for devices that require flat-top battery contacts.
• IMR Chemistry: Engineered for stable and consistent performance under load.
• Rechargeable & Compact: 21700 size offers a balance of capacity, power, and portability.

Overview

The Efest 21700 4000mAh rechargeable lithium-ion battery combines high capacity with strong discharge performance in a compact 21700 format. With a 30A maximum continuous discharge rating and flat-top, unprotected design, this cell is intended for devices engineered to handle high-drain lithium-ion power. It’s a reliable option for users who need sustained energy and dependable output.

Applications / Uses

• 21700-compatible flashlights
• Portable power tools and equipment
• DIY electronics and custom battery assemblies
• Bench testing and evaluation projects
• Replacement batteries for compatible lithium-ion devices

Specifications

Manufacturer:	Efest
Size:	21700
Nominal Capacity:	4000mAh
Nominal Voltage:	3.7V
Maximum Voltage:	4.2V
Discharge:	30A Maximum Continuous
Positive:	Flat
Protected:	No
Rechargeable:	Yes
Dimensions:	21.3mm x 70.2mm
Weight:	66.37g

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