Product Description:
The BAK 21700 50D is a next-generation high-drain lithium-ion battery engineered with advanced tabless technology. This 2pcs bundle delivers a massive 5000mAh capacity, an ultra-low internal resistance of just 4mΩ, and a wide operating temperature range from -40°C to 60°C. It sets a new standard for 21700 performance, providing explosive power and exceptional reliability even in extreme cold environments.
Unlike traditional cells that use threaded or spiral-welded negative terminals, the BAK 50D features a unique spot-welded negative terminal design. This advanced manufacturing process contributes to its ultra-low resistance and superior performance. With its wide temperature range, it is the ultimate power source for high-power devices, cold-weather flashlights, electric tools, and outdoor equipment.
Key Features:
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BAK 21700 50D Premium Cell: Next-generation high-drain Li-ion battery with advanced tabless technology.
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5000mAh High Capacity: Provides massive energy for extended runtimes.
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Ultra-Low Internal Resistance (4mΩ): Ensures minimal heat generation and maximum power transfer efficiency.
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Wide Operating Temperature (-40°C to 60°C): Delivers reliable performance in extreme cold and hot environments, perfect for northern winters.
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Advanced Tabless Technology: Newer tabless design offers lower internal resistance and better performance compared to traditional spiral-welded cells.
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Unique Spot-Welded Negative Terminal: Features a spot-welded imprint at the negative terminal, a distinct mark of its advanced manufacturing process.
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Standard 21700 Size: Perfectly fits standard 21700 battery compartments (21mm x 70mm).
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Versatile Applications: Ideal for high-power flashlights, electric tools, drones, and outdoor gear.
Product Parameters:
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Brand: BAK
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Model: 50D
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Size: 21700
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Capacity: 5000mAh
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Nominal Voltage: 3.7V
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Full Charge Voltage: 4.2V
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Internal Resistance: Approx. 4mΩ (Tested at low temperature)
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Chemistry: Li-ion (Lithium Ion)
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Operating Temperature: -40°C to 60°C
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Negative Terminal: Spot-welded imprint (Non-threaded/Non-spiral)
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Dimensions: 21mm (Diameter) x 70mm (Height)
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Pack Quantity: 2pcs
Applications:
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High-Power Tactical Flashlights: Powers the brightest flashlights and searchlights with extreme 4mΩ low internal resistance.
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Cold-Weather Outdoor Gear: Ideal for outdoor equipment and power tools used in extreme cold environments.
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High-Performance Drones & RC Hobbies: Provides sustained high-current power for heavy-lift drones and RC vehicles.
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Cordless Power Tools: Delivers high-power output for demanding power tools and electric drills.
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Professional Industrial Equipment: Reliable power for industrial applications requiring high discharge and wide temperature tolerance.
Frequently Asked Questions (FAQ):
Q1: What is the advantage of tabless technology?
A1: Tabless technology eliminates the traditional spiral or threaded connections, resulting in significantly lower internal resistance. For the BAK 50D, this translates to an ultra-low 4mΩ IR, which means less heat generation and more power delivered to your device.
Q2: What is the operating temperature range of this battery?
A2: The BAK 50D has an impressive operating temperature range of -40°C to 60°C. This makes it the ideal choice for devices used in extreme cold environments, such as northern winters or high-altitude operations.
Q3: Is the 5000mAh capacity real?
A3: Yes. The BAK 50D delivers a true 5000mAh capacity, providing reliable, long-lasting energy for high-drain devices.
Q4: How does the negative terminal differ from traditional batteries?
A4: Unlike traditional batteries that use threaded or spiral-welded negative terminals, the BAK 50D features a spot-welded imprint at the negative terminal. This advanced manufacturing technique is a hallmark of its superior engineering.
Q5: What kind of charger should I use for this battery?
A5: You must use a charger specifically designed for 3.6V/3.7V Li-ion batteries with a 4.2V cut-off voltage. Do not use a standard AA/AAA Ni-MH charger.
