Name: SPERAS S50 21700 5000mAh Battery
Brand: Speras Flashlight
Availability: InStock

Unleash True Performance

Premium LG Cell & High-Drain Output

Not all batteries are created equal. The SPERAS S50 is powered by a 100% new, authentic LG internal cell, guaranteeing true 5000mAh capacity without false advertising.

With a continuous discharging current of 9.8A and a maximum burst of 15A, it easily drives high-lumen flashlights to their maximum Turbo output without voltage sagging.

SPERAS S50 21700 battery featuring LG cell and high drain 15A max current

Intelligent Safety Protections

Safety is our top priority. The S50 features a highly sophisticated built-in protection circuit board (PCB) to ensure the maximum lifespan of your battery and the safety of your devices.

Triple Defense: Prevents Over-charging, Over-discharging, and Short-circuiting.
Impact Resistant: Features a unique structural design that protects the internal core from drops and severe shocks.

Backed by SPERAS Quality

We stand behind our power sources. The SPERAS S50 comes with a comprehensive 1-Year Manufacturer Warranty.

If you experience any performance issues or defects, we will exchange it or provide a new one immediately. Buy and operate your gear with absolute confidence.

🔦 The Perfect Power Source for SPERAS Flashlights

The S50 battery is specifically engineered to handle the extreme power demands of our professional lighting gear. It is the highly recommended primary or backup power source for:

SPERAS P4 (4000 Lumens Searchlight) - Maximizes the P4's turbo output and ensures up to 167 hours of runtime.
It is also fully compatible with most standard high-drain 21700 flashlights on the market.

Technical Specifications

Brand: SPERAS
Model: S50
Internal Cell: LG Cell
Capacity: 5000mAh
Voltage: 3.6V (18.0Wh)

Charging Current: 1A (Recommended), 2A (Max)
Discharging Current: 9.8A (Continuous), 15A (Max)
Dimensions: 75mm (Length) x 21.4mm (Diameter)
Net Weight: 72.8g
Warranty: 1 Year

Frequently Asked Questions (FAQ)

Can I use this 21700 battery in an 18650 flashlight?

No. The 21700 battery is larger (21.4mm diameter, 75mm length) than an 18650 battery. It will not fit in flashlights designed strictly for 18650 batteries. Please ensure your flashlight or device specifically supports 21700 sized batteries.

Is this a protected or unprotected battery?

The SPERAS S50 is a Protected battery. It features a built-in intelligent circuit board at the positive pole that actively prevents over-charging, over-discharging, and short circuits, making it exceptionally safe for daily use.

What kind of charger should I use?

We recommend using a high-quality smart charger specifically designed for lithium-ion batteries. For optimal battery life, a charging current of 1A is recommended, though it safely supports up to 2A fast charging.

Why does my high-lumen flashlight need a "High Drain" 15A battery?

High-performance flashlights (like the 4000-lumen SPERAS P4) require massive amounts of power instantly to reach their Turbo modes. Standard batteries will suffer from voltage drop and fail to activate Turbo. The S50's 15A max discharge rate easily handles these extreme power demands.

SPERAS S50 21700 5000mAh Battery

About SPERAS S50 21700 5000mAh Battery

SPERAS S50: 5000mAh 21700 Li-ion Battery