Every UltraFire cell undergoes rigorous testing to ensure it meets our uncompromising standards for safety and performance.
10A
Max Discharge
500+
Cycles
Capacity
5000mAh
High Density Lithium
Voltage
3.7V
4.2V Peak Charge
Protection
PCB Built-in
Triple Safety Layer
Lifespan
500+ Cycles
Long-term Reliability
Advanced PCB Protection
Our integrated protection circuit board guards against overcharge, over-discharge, and short circuits, ensuring your devices and batteries stay safe under any conditions.
High-Drain Performance
Optimized for high-performance flashlights and electronic gear, the 21700 cell provides a steady 10A discharge rate without voltage sag.
Thermal Stability
Advanced chemical composition and structural design allow for excellent heat dissipation, maintaining peak performance even during extended high-power use.
The 21700 Advantage
Compared to traditional 18650 cells, the 21700 format offers significantly higher energy density and better power delivery.
Standard Cell
18650
Capacity
3400mAh
Power Output
Medium
UltraFire Premium
21700
Capacity
5000mAh
Power Output
High Performance
Power Your Next Adventure
Don't settle for less. Get the original UltraFire 21700 5000mAh protected batteries today and experience the difference.
Q1: Is the 21700 battery safe to use?
Yes, our 21700 batteries come with a built-in protection board and are CE, FCC, MSDS, and UN38.3 certified for safe and reliable use.
Q2: How do I charge and maintain a 21700 battery?
Use a compatible charger designed for lithium-ion batteries. Avoid overcharging or exposing the battery to extreme heat, and store it in a cool, dry place when not in use.
Q3: How long does a 21700 battery last?
With proper use and charging, a 21700 battery can last for hundreds of charge cycles, providing long-lasting and reliable performance.
Satisfied or Refunded
30-Day Return Policy
7-Day Free Replacement
Three-year warranty on flashlights; one-year warranty on all other products.
Retail orders
Products shipped from our US warehouses typically arrive within 3–7 business days.
International orders shipped from our China warehouses typically take 7–17 business days to deliver.
Satisfied or Refunded
PayPal, Apple Pay, Google Pay, Visa, American Express, Mastercard, Discover, JCB, Diners Club, CB, Maestro, Mada
Q1: What if my new flashlight has a defect or doesn’t work properly?
A: While rare, even brand-new flashlights can sometimes have issues like short circuits or other malfunctions. Rest assured, we take this seriously — if anything isn’t perfect, we will immediately replace it. Our goal is for every customer to receive a flawless, fully functioning flashlight, and we won’t settle for less.
Q2: Do you really offer a three-year warranty?
A: Within 3 years of purchase, we provide after-sales service for any quality issues, including free repairs or replacements. Additional batteries, chargers, and purchased accessories are covered by a 1-year warranty.
A: Yes. Our checkout process uses encrypted, PCI-compliant payment systems. Your personal and payment information is always safe.
Q4: Do you really offer free shipping?
A: Yes! All orders ship free worldwide, with tracking included. No hidden fees.
Q5: How long does shipping take?
A: Shipping times vary by location. If your order is shipped from a local warehouse, delivery usually takes 2–5 days. For international shipping, most orders arrive within 7–15 business days. You’ll receive a tracking number once your order is on the way.
