Description
Unleash the full potential of your high-drain devices with the EFEST 21700 30A 4000mAh Flat Top Rechargeable Battery. Engineered for superior performance, this battery boasts a robust 4000mAh capacity and an impressive 30A maximum continuous discharge, making it an ideal choice for power-intensive applications such as vaping devices, high-performance flashlights, and portable power tools. Experience reliable power delivery, enhanced durability, and exceptional safety with EFEST's advanced IMR chemistry, all packaged in a versatile 21700 size.
- High Capacity:4000mAh capacity ensures long-lasting use between charges, perfect for devices requiring sustained power.
- Powerful Performance: 30A maximum continuous discharge provides robust power delivery for high-drain applications, supporting demanding electronic devices efficiently.
- Versatile Usage: Ideal for use in a wide range of devices, including portable power tools, and high-output flashlights.
- Advanced Safety Features: Unprotected flat top design made with IMR chemistry for a safer performance under high-discharge conditions.
- Optimal Dimensions and Weight: Sleek measurements (70.20 mm x 21.50 mm) and a lightweight design (68.0g) make it easy to carry and fit into compatible 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, UNPROTECTED |
| Rechargeable: | Yes |
| Dimensions: | 21.3mm x 70.2mm |
| Weight: | 66.37g |
| Country of Origin: | China |
⚠ Important Safety Warnings
Improper handling or misuse of this lithium-ion battery can result in FIRE, EXPLOSION, or THERMAL RUNAWAY, causing personal injury, property damage, or death. Users must read and follow all safety guidelines before purchase and use. Click here to review the full safety guidelines.
- Critical Warning: Never carry loose batteries in your pocket, purse, or bag. Loose batteries can come into contact with metal objects like keys or coins, causing a short circuit, which may result in severe burns, fire, or explosion. Always store or transport batteries in a protective case.
- Intended Use: This battery is designed for integration into protected battery packs with a Battery Management System (BMS) or Protection Circuit Board (PCB). It is not intended for standalone use or for e-cigarettes, vaporizers, or similar devices.
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Thermal Runaway: A chain reaction where heat from a failing battery
causes further overheating, potentially leading to fire or explosion.
- Causes: Overcharging, short circuits, physical damage, or exposure to high temperatures.
- Prevention: Use a smart charger, avoid damage, and store batteries in a cool, dry place.
- Storage & Transport: Always store batteries in protective cases to prevent accidental contact with metal objects. Never store loose batteries in pockets, purses, bags, or near conductive materials.
- Inspection: Do not use if the PVC wrapper, terminal insulator, or casing is damaged, dented, leaking, or bulging. Continued use could result in failure, fire, or explosion.
- Charging: Use a smart charger specifically designed for lithium-ion batteries and ensure the charger's voltage matches the battery's specifications. Never overcharge, over-discharge, or leave unattended while charging.
-
Prohibited Activities:
- Do not expose the battery to extreme heat, fire, or liquids.
- Do not short circuit, puncture, crush, or modify the battery.
- Do not charge or discharge beyond the manufacturer’s voltage range.
- Do not dispose of in regular trash—always recycle at approved facilities.
- Emergency Response: If the battery overheats, emits smoke, or swells, move it to a non-flammable surface (e.g., sand or concrete) and stop use immediately. In case of fire, use a Class D fire extinguisher or sand. Do not use water.
Disclaimer
18650Battery.com is not responsible for any damages, injuries, or claims arising from improper use, handling, or failure to follow these safety guidelines. Lithium-ion batteries require strict adherence to all safety protocols. It is the reseller's responsibility to ensure all safety warnings and product guidelines are effectively communicated to customers. Users and resellers assume full responsibility for the safe handling, usage, and distribution of this product.