The Samsung 21700 5000mAh Li-ion Battery is a high-capacity power solution designed for devices requiring long runtime and reliability. With a 5000mAh capacity, 3.6-4.2V voltage range, and advanced lithium-ion chemistry, it supports high-drain applications like electric vehicles, power tools, and energy storage systems. Its optimized cycle life and safety features make it a top choice for industrial and consumer use.
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What Are the Key Specifications of the Samsung 21700 Battery?
The Samsung 21700 5000mAh Battery features a diameter of 21mm, length of 70mm, and nominal voltage of 3.6V (4.2V max). It delivers a continuous discharge current of 15A and weighs 69g. The nickel-plated steel casing ensures durability, while its NMC (Nickel Manganese Cobalt) chemistry balances energy density, thermal stability, and cycle life (up to 500 cycles at 80% capacity retention).
| Parameter | Specification |
|---|---|
| Capacity | 5000mAh (min 4850mAh) |
| Max Charge Voltage | 4.20V ± 0.05V |
| Standard Charge Current | 2.45A |
| Operating Temperature | -20°C to 60°C |
Recent third-party testing reveals these cells maintain 91% capacity after 300 cycles when charged at 0.5C rate. The optimized electrode density (3.6g/cm³) contributes to both energy storage capacity and mechanical stability. For industrial users, the battery’s 15mΩ internal resistance enables efficient power delivery in UPS systems and robotics applications.
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How Does the Samsung 21700 Compare to Other Lithium-Ion Batteries?
Unlike standard 18650 cells, the Samsung 21700 offers 50% higher capacity and 20% better energy density. It outperforms competitors like LG M50 and Murata 20700 in runtime and thermal management. Its 5000mAh capacity surpasses most 21700-class batteries, which average 4000-4800mAh. This makes it ideal for applications demanding sustained power, such as drones and solar energy storage.
How to Maximize the Lifespan of Your Samsung 21700 Battery?
Avoid discharging below 2.5V or charging above 4.2V to prevent capacity degradation. Store at 20°C and 50% charge if unused for months. Use a balanced charger to maintain cell uniformity in multi-battery setups. Samsung recommends partial discharges (20-80%) rather than full cycles to extend cycle life beyond 500 cycles.
Advanced users should monitor cell voltage differentials in battery packs – keep cells within 0.05V of each other for optimal performance. When storing for over 6 months, perform capacity “refresh” cycles every 90 days. Industrial applications benefit from implementing temperature-controlled charging stations, as keeping cells at 15-25°C during charging can double cycle life compared to uncontrolled environments.
Why Is Thermal Stability Crucial for the Samsung 21700?
Thermal stability prevents overheating, a common cause of battery failure. Samsung’s electrode coating and separator design minimize internal resistance, reducing heat generation during fast charging (up to 4A). The battery’s CID (Current Interrupt Device) and PTC (Positive Temperature Coefficient) mechanisms disconnect circuits during overcurrent or overheating, ensuring compliance with UL 1642 and IEC 62133 safety standards.
“Samsung’s multi-layer ceramic separator can withstand temperatures up to 180°C without shrinkage – 40% higher than industry standard materials.”
FAQ
- Can I use this battery in my vaping device?
- Yes, but ensure your device supports 21mm-diameter cells. Avoid exceeding the 15A continuous discharge rating to prevent overheating.
- How long does it take to charge fully?
- Approximately 4 hours with a standard 1A charger. Fast chargers (2-4A) can reduce this to 1.5-2 hours, but may slightly shorten cycle life.
- Is the Samsung 21700 compatible with Tesla vehicles?
- No. Tesla’s 21700 cells are custom-designed. The Samsung 21700 is used in third-party EV conversions and energy storage systems.