XTAR VC4SL Smart Charger with 21700 4900mAh 10A Battery Bundle | 3A Fast Charging with Capacity Grading & IR Test for Flashlights and Drones

Product Description

This bundle combines the advanced XTAR VC4SL 4-slot smart battery 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 a massive 4900mAh capacity with a 3.6V rated voltage and supports a robust 10A maximum continuous discharge current, making it an excellent choice for high-drain devices. The VC4SL charger offers not only QC3.0 3A fast charging via Type-C, but also professional testing features such as Capacity Grading to measure true mAh, Internal Resistance testing to detect aging cells, and a Storage mode to automatically maintain batteries at their optimal 3.7V storage voltage. This kit provides a comprehensive, intelligent, and safe power solution for your electronic gear.

Key Features

• Complete High-Performance Kit: Includes one XTAR VC4SL 4-slot smart charger (with Type-C cable & storage pouch) and one or two XTAR 21700 4900mAh 10A batteries.

• Massive Battery Capacity: The battery provides 4900mAh capacity, a 3.6V nominal voltage, a 4.2V charging cut-off voltage, and supports a 10A maximum continuous discharge current, ensuring long-lasting and stable power.

• Fast QC3.0 Charging: The VC4SL features a Type-C input supporting 9V (QC3.0) power, allowing for an ultra-fast 3A single-slot charging current. Currents can be adjusted to 2A for dual slots, and 1A/0.5A/0.25A for four-slot charging based on needs.

• Advanced Battery Diagnostics: Equipped with a clear LCD screen, it offers a Capacity Grading mode to reveal the true capacity (mAh) via a charge-discharge-charge cycle, and an accurate Internal Resistance (IR) test to identify aging or damaged batteries.

• Intelligent Storage Mode: The charger's Storage Mode will automatically charge or discharge the battery to the optimal long-term storage voltage (3.7V for Li-ion, 1.2V for Ni-MH), significantly slowing down capacity degradation over time.

• Wide Compatibility & Precision Voltage: The VC4SL's spring-loaded slots support a vast array of 3.6V/3.7V Li-ion batteries (10440 to 32650) and 1.2V Ni-MH/Ni-CD batteries. It features a highly precise charging cut-off voltage of 4.20V ± 0.05V for Li-ion to ensure safe and full charging without damage.

Product Parameters

Charger (XTAR VC4SL):

• Input Power: QC3.0 Type-C (9V/2A, Max 18W)

• Constant Charging Current: 3Ax1 / 2Ax2 / 1Ax4 / 0.5Ax4 / 0.25Ax4

• Charging Cut-off Voltage: 4.20V ± 0.05V (Li-ion) / 1.45V ± 0.1V (Ni-MH)

• Charging Cut-off Current: ≤120mA

• Optimal Storage Voltage: 3.7V (Li-ion), 1.2V (Ni-MH)

• Operating Temperature: 0°C - 40°C

• Dimensions: L156 x W115 x H35 mm

• Net Weight: 212g

• Supported Battery Types: 3.6V/3.7V Li-ion (IMR/INR/ICR), 1.2V Ni-MH/Ni-CD

• Supported Li-ion Sizes: 10440, 14500, 14650, 16340, 17335, 17500, 17670, 18350, 18490, 18500, 18650, 18700, 20700, 21700, 22650, 25500, 26650, 32650 (Flat Top)

• Supported Ni-MH Sizes: AAA, AA, A, SC, C

Battery (XTAR 21700 4900mAh):

• Brand: XTAR

• Model: 21700 Rechargeable Li-ion Battery

• Nominal Capacity: 4900mAh

• Nominal Voltage: 3.6V

• Charging Cut-off Voltage: 4.2V

• Max Continuous Discharge Current: 10A

• Weight: 71g

• Dimensions: 21.4 ± 0.3mm (Diameter) x 74.8 ± 0.5mm (Height)

• Note: Manual measurement may have an error margin of 0.5mm.

Applications

• Provides long-lasting power for high-lumen tactical flashlights and EDC searchlights.

• Professional battery grading and power management for RC drones and model aircraft.

• Reliable energy for portable radios, intercoms, and outdoor communication equipment.

• Backup power supply for emergency kits, power banks, and outdoor camping gear.

Frequently Asked Questions (FAQ)

Q1: What is included in this bundle?
A1: This bundle includes one XTAR VC4SL 4-slot smart charger, one Type-C fast charging cable, one user manual, one travel storage pouch, and either 1 or 2 units of the XTAR 21700 4900mAh 10A batteries based on your selection.

Q2: Is the 21700 4900mAh battery compatible with the VC4SL charger?
A2: Yes. The VC4SL features a flexible spring-loaded slot design that is specifically engineered to accommodate protected 21700 batteries (21.4mm x 74.8mm) safely and securely.

Q3: What does the 10A discharge current mean for my devices?
A3: The 10A maximum continuous discharge current ensures the battery can safely deliver high power to devices requiring high drain, like powerful flashlights and drone motors, without overheating or voltage sag.

Q4: What are the actual voltage parameters of the charging cut-off?
A4: The VC4SL uses a highly precise charging cut-off voltage of 4.20V ± 0.05V for 3.6V/3.7V lithium-ion batteries and 1.45V ± 0.1V for 1.2V Ni-MH batteries, ensuring full charge without overcharging risks. The Storage mode will maintain a safe voltage of 3.7V for this 21700 battery.

Q5: How do I achieve the maximum 3A charging speed?
A5: To reach 3A fast charging, you must use a QC3.0 (9V/2A) power adapter, insert a battery into a single slot, and do not insert any other batteries into the charger. The charger will automatically detect the input voltage and regulate the optimal current.