Product Description
This bundle combines the flagship XTAR VC8 8-slot professional-grade smart charger with high-capacity XTAR 21700 4900mAh 10A lithium-ion rechargeable batteries. (Available in 1-Pack or 2-Pack options). The included 21700 battery delivers an impressive 4900mAh true capacity, a 3.6V nominal voltage, and a robust 10A maximum continuous discharge current, making it an ideal powerhouse for high-drain consumer electronics. The XTAR VC8 charger offers eight independent charging circuits, dual high-definition VA LCD screens, and a powerful 3A fast charging mode. It goes far beyond basic charging with professional features: Capacity Grading to measure true mAh, Internal Resistance testing, and an intelligent Storage mode that automatically maintains the optimal 3.7V long-term voltage. This kit provides the ultimate professional power management and health diagnostic solution for enthusiasts and professionals.
Key Features
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Complete High-Capacity Power Kit: Includes one XTAR VC8 8-slot smart charger (with USB cable) and one or two XTAR 21700 4900mAh 10A batteries based on your selection.
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High-Capacity Battery Specifications: Features 4900mAh true capacity, a 3.6V nominal voltage, a 4.2V charging cut-off, and a 10A max continuous discharge current. The battery weighs 71g and measures 21.4mm in diameter and 74.8mm in height.
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8 Fully Independent Charging Slots: Each slot features independent circuit control, allowing you to charge various battery types (Li-ion and Ni-MH) without mutual interference. Designed with extended slots to safely accommodate protected 21700 batteries.
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3A Ultra-Fast Charging: Equipped with a QC3.0 Type-C input, providing a maximum 3A charging current when a single battery is placed in slot CH1 or CH8, drastically reducing downtime.
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Dual VA LCD Screens & Advanced Diagnostics: High-contrast dual screens display real-time voltage, current, capacity (mAh), and internal resistance. The Capacity Grading mode (supported in CH1-CH4) runs a full charge-discharge-charge cycle to reveal true battery health.
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Intelligent Storage Mode & 0V Activation: Automatically charges or discharges batteries to the optimal long-term storage voltage of 3.7V for Li-ion batteries to prevent capacity loss. The 0V activation feature safely revives over-discharged batteries.
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Adjustable Charging Currents: Offers four manual current gears: 250mA, 500mA (8 slots), 1000mA (4 slots), and 2000mA (Slots CH1/CH8).
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Comprehensive Safety Protections: Built-in over-voltage, over-current, short-circuit, reverse polarity, and over-charge protection, paired with an intelligent temperature control system.
Product Parameters
Charger (XTAR VC8):
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Model: XTAR VC8
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Input Power: QC3.0 Type-C (5V⎓2A / 9V⎓2A)
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Adjustable Charging Current: 3A x 1 / 2A x 2 / 1A x 4 / 0.5A x 8 / 0.25A x 8
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Charging Cut-off Voltage: 4.20 ± 0.05V (Li-ion) / 1.45 ± 0.1V (Ni-MH)
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Charging Cut-off Current: ≤120mA
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Operating Temperature: 0 - 40°C
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Dimensions: L194mm x W134mm x H34mm
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Net Weight: 350g
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Supported Li-ion Sizes: 10440, 14500, 14650, 16340, 17500, 17670, 18350, 18490, 18500, 18650, 18700, 20700, 21700, 22650, 25500, 26650 (Supports protected 20700 & 21700)
Battery (XTAR 21700 4900mAh):
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Brand: XTAR
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Model: 21700 Rechargeable Li-ion Battery
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Nominal Capacity: 4900mAh
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Nominal Voltage: 3.6V
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Charging Cut-off Voltage: 4.2V
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Max Continuous Discharge Current: 10A
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Weight: 71g
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Dimensions: 21.4 ± 0.3mm (Diameter) x 74.8 ± 0.5mm (Height)
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Note: Manual measurement has an error margin of 0.5mm.
Applications
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Professional battery capacity grading and long-term storage management.
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High-efficiency multi-slot charging for 21700 cells used in high-lumen EDC tactical flashlights and searchlights.
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Advanced battery diagnostics for RC drone batteries, including IR testing and accurate capacity sorting.
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Battery screening, pairing, and maintenance for DIY power bank builders and custom battery pack assemblers.
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Reliable power management for outdoor survival gear and emergency backup systems.
Frequently Asked Questions (FAQ)
Q1: What is included in this bundle?
A1: The bundle includes one XTAR VC8 8-slot smart charger, one USB-A to USB-C charging cable, one user manual, and either 1 or 2 units of the XTAR 21700 4900mAh 10A batteries based on your selected variant.
Q2: Can the VC8 accommodate protected 21700 batteries?
A2: Yes. The XTAR VC8 features wide, extended slots that are specifically designed to safely and securely accommodate protected 20700 and 21700 batteries, including the 21.4mm diameter and 74.8mm height of this model.
Q3: How do I achieve the maximum 3A fast charging speed with the VC8?
A3: To achieve 3A fast charging, you must use a QC3.0 (9V/2A) power adapter and charge a single battery exclusively in slot CH1 or CH8. The charger will automatically detect the input and adjust the current accordingly.
Q4: How does the "Capacity Grading" mode work for this 21700 battery?
A4: Capacity Grading mode (supported in CH1 to CH4) runs a complete charge-discharge-charge cycle. This accurately measures the true capacity of the 4900mAh cell, allowing you to easily identify if the battery is genuine, healthy, or has aged.
Q5: What is the purpose of the "Storage Mode" for Li-ion batteries?
A5: If you do not plan to use this 3.6V 21700 battery for an extended period, the Storage Mode will automatically charge or discharge it to the optimal long-term storage voltage of 3.7V. This significantly slows down capacity degradation and maximizes the battery's overall lifespan.
