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TrustFire 21700 Rechargeable Li-Ion Battery – 6000mAh 3.7V

$19.99

Built for real-world use
✓ Free shipping on all orders
✓ 30-day hassle-free returns
✓ Warranty on every product
✓ Ships fast from the US

  • 6000mAh capacity delivers long runtime for high-output devices
  • 21700 size provides stronger sustained power than smaller cells
  • Built-in protection supports safe charging and operation
  • Rechargeable lithium-ion design with no memory effect

FAQS
  • Is 6000mAh high capacity for a 21700 battery?
    Yes. 6000mAh provides extended runtime compared to standard-capacity cells.
  • Does this battery include protection?
    Yes. It includes built-in protection against short-circuit and overload.
  • Is there a memory effect?
    No. Lithium-ion chemistry allows recharging at any level.
  • Will this fit my flashlight?
    It fits devices specifically designed for standard 21700 batteries.

Full Specifications

• Battery Type: Rechargeable lithium-ion
• Size Format: 21700
• Capacity: 6000mAh
• Nominal Voltage: 3.7V
• Rechargeable: Yes
• Protection: Integrated short-circuit and overload protection
• Cycle Life: Up to 500 recharge cycles

Best Uses & Real-World Applications

• High-output flashlights designed for 21700 batteries
• Extended runtime applications
• Emergency and backup power kits
• Users who want fewer battery changes during use

Shipping Info

Orders typically ship within 24 hours (excluding holidays)

Description

21700 Rechargeable Lithium-Ion Battery

The TF 21700 rechargeable battery is built for users who want maximum runtime without constant battery swaps. With a high 6000mAh capacity at 3.7V, it delivers sustained power for high-output flashlights and compatible devices.

The larger 21700 format stores more energy than smaller cells, supporting longer use while maintaining stable output. Integrated protection helps support safe charging and operation, guarding against short-circuit and overload.

Rechargeable lithium-ion chemistry offers no memory effect, making it easy to recharge at any level and reuse repeatedly for long-term value.

Why Choose The TF 21700 Battery

  • Massive 6000mAh capacity supports extended runtime per charge
  • 21700 size delivers strong, consistent power output
  • Built-in protection supports safer charging and use
  • Rechargeable design with no memory effect

Frequently asked questions

Is this a genuine product with a valid warranty?

Yes. We are an authorized dealer for Klarus and TrustFire, so every light we ship is genuine and carries the full manufacturer warranty, handled by us. Flashlights bought through unauthorized or grey-market sellers are usually not covered.

How fast do you ship, and what does it cost?

Orders placed on business days leave our Port Charlotte, Florida warehouse within 24 hours. Shipping is free on US orders over $49. We hold our own stock, so if the site shows it in stock, it is on a shelf here.

What is your return policy?

Returns are accepted within 30 days through a simple return process. See our refund policy for full details, or email us first if you are unsure whether a light is the right one and we will help you decide before you buy.

How many lumens do I actually need?

More than most people expect to hear: usually fewer than you think. 200 to 500 lumens covers everyday tasks, 500 to 1,500 covers work and duty use, and above that you are buying reach rather than usable working light. Runtime drops sharply at maximum output on every light ever made.

What is the difference between lumens and beam distance?

Lumens measure total light output. Candela measures beam intensity, and that is what determines how far a light throws. A tightly focused 1,000-lumen thrower will out-distance a 3,000-lumen floodlight, which is why reflector design matters as much as the headline number.

Which battery does it take, and do you sell spares?

Most of our lights use a built-in or removable lithium-ion cell such as a 14500, 16340, 18650, 21700 or 26650. The size is listed in the product specifications. We stock protected cells in all of those sizes plus a multi-chemistry charger, so you can keep a charged spare ready.

Can you help me choose between two models?

Yes, and we would rather do that than have you return something. Email Customersupport@brightlightled.shop or call 941-273-3209, Monday to Friday 8am to 5pm EST, with the two models and how you plan to use the light.

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