The IMREN 21700 4000mAh 35A Rechargeable Lithium Battery is a high-performance power source designed to meet the demands of devices requiring a stable current and high discharge rate. Engineered with precision and built for reliability, this battery is optimized for high-drain applications, ensuring consistent energy delivery and long-lasting performance. With a 4000mAh capacity, it provides an extended runtime, making it ideal for users who need sustained power without frequent recharging. Whether for high-powered flashlights, vaping mods, or industrial equipment, this battery is designed to deliver exceptional power and efficiency.

Stability and security were the top priorities in the design of this battery, ensuring that it meets the highest standards for safe and reliable operation. Rigorously tested for safety and quality assurance, it provides users with confidence in its performance, making it a trusted energy solution for demanding applications. The 35A continuous discharge current makes it particularly well-suited for devices that require a rapid and steady energy output. Unlike conventional batteries that may struggle with high-drain usage, the IMREN 21700 maintains its voltage stability, allowing devices to function at optimal efficiency without power fluctuations.

The nominal voltage of 3.7V and a maximum charge voltage of 4.2V ensure a consistent energy supply, preventing premature voltage drops that could affect device performance. The flat-top terminal design enhances compatibility with a variety of devices, making it an excellent choice for users who require a versatile power source. Built with lithium-ion technology, this battery is engineered for longevity, allowing multiple charge and discharge cycles without experiencing significant capacity loss. Its high energy retention and efficient power delivery make it a cost-effective alternative to disposable batteries, reducing waste and promoting sustainability.

Designed for durability, the IMREN 21700 4000mAh battery maintains a robust structure that ensures reliability in demanding environments. With an approximate weight of 70 grams and dimensions of 21.80mm x 70.80mm, it is compact yet powerful, fitting seamlessly into most devices that require a 21700 format. The battery’s unprotected design allows it to deliver raw power directly, making it ideal for users who understand battery management and require high-performance cells for specialized equipment.

For charging, the IMREN 21700 4000mAh battery follows standard lithium-ion charging protocols, ensuring safety and efficiency. The CCCV (constant current, constant voltage) charging method prevents overcharging and optimizes battery lifespan, allowing for safe and controlled recharging. The high-quality construction minimizes energy loss, ensuring that the battery retains its charge effectively over multiple cycles. By maintaining a low internal resistance, the battery improves efficiency, reducing heat buildup and enhancing overall performance during operation

SPECIFICATIONS

SHIPPING
The final shipping cost and estimated delivery timeframe will be available to you during checkout. Currently, we offer 3 International shipping methods which are steady and easy to track. Priority worldwide shipping, Premium ( Partial countries) and a faster Express shipping. The estimated times stated below are not guaranteed. An international package could experience delays like postal strikes or severe weather or Cov-19 situation. All shipping ways, PO Box address is not acceptable.

For some flashlights, there's a pure battery inside（phone charging）,If We can not ship your packages via USPS or DHL,we'll ship your package in another way.

Note:
When you place an order for just the batteries, for easy shipping, faster and safe delivery, the batteries are placed in the flashlights.

If you don’t receive your order within the estimated time frame provided below and suspect that it might be lost in transit, please contact Flashlightgo Support ( support@flashlightgo.com ) and we can look into the order with the courier. Lost-in-transit requests must be submitted to Flashlightgo Support within 3 months of the date of shipping or before the courier archives the tracking information.

Option 1.
Express by DHL/UPS/Fedex/Aramax/SF etc ( there may be tax need to pay in this way),
The estimated time of delivery is usually 3-7 work days depending on the country. Includes detailed tracking and confirmation of delivery.

Option 2.
Premium ( 6-10days, All tax and Duty Paid),
All tax and duty are prepaid to carrier by Flashlightgo before shipping, so you dont need to pay any tax or duty when you get it.

Option 3.
Priority shipping(1-2 Weeks, average 10 days)
If we marked it is with all tax and duty paid, all tax and duty are prepaid to carrier by Flashlightgo before shipping, so you dont need to pay any tax or duty when you get it.

Learn more,Please click on Here.

To ensure that you get the desirable product, we allow a seven-day product return period. Any product return application outside this period will not be entertained.
All returned product must be unused and the original package should be kept.

Return：
We do not offer return for personal products like socks and hats or food, magazine and fragile or dangerous products The original receipt must be available for application of return.

Discount products：
No product return for discount products

Gifts products：
If the item is marked as a gift when purchased and shipped directly to you, it cannot be exchanged , refunded or warranty.

Exchange：
We only replace items if they are defective or damaged.
Exchange service are offered only to wrong deliveries or product damage not caused by client. If needed, please email to info@flashlightgo.com.

Warranty
How long is the warranty period?
Flashlightgo warrants to the original purchaser that the Product(s) shall be free of any defect in material or workmanship for a period of one year for labor and one year for parts from the date of the original order except the items listed below:
Chargers,Batteries and Other Accessories: 3 months warranty

Should the Product(s) supplied by Flashlightgo prove defective because of improper workmanship or material as reasonably determined by us, Flashlightgo agrees, at its option, to either repair or replace the Product free of charge, excluding any shipping or handling charges.

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