21700 5000mAh 3.7V Rechargeable Batteries (2-Pack) - UltraFire
21700 5000mAh 3.7V Rechargeable Batteries (2-Pack) - UltraFire
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1-Year_Free_Warranty - UltraFire
1-Year_Free_Warranty - UltraFire
21700 5000mAh 3.7V Rechargeable Batteries (2-Pack) - UltraFire
21700 5000mAh 3.7V Rechargeable Batteries (2-Pack) - UltraFire
21700 5000mAh 3.7V Rechargeable Batteries (2-Pack) - UltraFire
21700 5000mAh 3.7V Rechargeable Batteries (2-Pack) - UltraFire
21700 5000mAh 3.7V Rechargeable Batteries (2-Pack) - UltraFire
21700 5000mAh 3.7V Rechargeable Batteries (2-Pack) - UltraFire
21700 5000mAh 3.7V Rechargeable Batteries (2-Pack) - UltraFire
21700 5000mAh 3.7V Rechargeable Batteries (2-Pack) - UltraFire
21700 5000mAh 3.7V Rechargeable Batteries (2-Pack) - UltraFire
21700 5000mAh 3.7V Rechargeable Batteries (2-Pack) - UltraFire
21700 5000mAh 3.7V Rechargeable Batteries (2-Pack) - UltraFire
21700 5000mAh 3.7V Rechargeable Batteries (2-Pack) - UltraFire

UltraFire® 21700 Rechargeable Battery

5000mAh | 3.7V | Protected

The UltraFire 21700 5000mAh rechargeable battery powers with high-drain output, built-in protection, and long-lasting, rechargeable reliability.
$29.99
$42.99
SALE 30% OFF

Free Shipping 

Easy Returns

1-Year Warranty
Included

Specifications

Brand

UltraFire
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Battery Type

21700 Rechargeable Battery
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Material

Li-ion
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Capacity

5000mAh
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Voltage

3.7V
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Max Continuous Discharge

10A
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Energy

18.5 Wh
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Rechargeable

>1000 cycles
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Size

36.5mm x 16.7mm
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Weight

70g
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Chargeable

Yes
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Protective Case

Yes
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Certifications

CE, FCC, MSDS, UN38.8

Reviews

Customer Reviews

Based on 2 reviews
100%
(2)
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(0)
0%
(0)
0%
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(0)
L
Luke
Great battery!

It holds a charge well, recharges quickly, and delivers strong, reliable power every time.

E
Edmund Kelley
Battery

Best flash light I ever had

FAQ

Frequently asked questions

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.