XTAR VC4SL Smart Charger with 21700 4900mAh 10A Battery Bundle | 3A Fast Charging with Capacity Grading & IR Test for Flashlights and Drones
Description
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
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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.
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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.
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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.
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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.
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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.
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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):
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Input Power: QC3.0 Type-C (9V/2A, Max 18W)
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Constant Charging Current: 3Ax1 / 2Ax2 / 1Ax4 / 0.5Ax4 / 0.25Ax4
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Charging Cut-off Voltage: 4.20V ± 0.05V (Li-ion) / 1.45V ± 0.1V (Ni-MH)
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Charging Cut-off Current: ≤120mA
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Optimal Storage Voltage: 3.7V (Li-ion), 1.2V (Ni-MH)
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Operating Temperature: 0°C - 40°C
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Dimensions: L156 x W115 x H35 mm
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Net Weight: 212g
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Supported Battery Types: 3.6V/3.7V Li-ion (IMR/INR/ICR), 1.2V Ni-MH/Ni-CD
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Supported Li-ion Sizes: 10440, 14500, 14650, 16340, 17335, 17500, 17670, 18350, 18490, 18500, 18650, 18700, 20700, 21700, 22650, 25500, 26650, 32650 (Flat Top)
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Supported Ni-MH Sizes: AAA, AA, A, SC, C
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 may have an error margin of 0.5mm.
Applications
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Provides long-lasting power for high-lumen tactical flashlights and EDC searchlights.
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Professional battery grading and power management for RC drones and model aircraft.
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Reliable energy for portable radios, intercoms, and outdoor communication equipment.
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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.
Shipping and Returns
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Free Shipping: Enjoy free shipping on all orders over $65. For orders under $65, the shipping cost is $8.99.
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Delivery Time: Once shipped, orders typically arrive within 7–15 business days.
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Easy Returns: We want you to be completely satisfied. If you're not, you can return your product within 30 days of receiving your order. Please ensure the items are unused and in their original condition. For return instructions, please contact our support team.
Payment & Security
Payment methods
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
Security
The charger is intuitive, the batteries hold charge well. I use them for my Astro photography gear. The bundle arrived well-packaged. Highly recommended.
This bundle keeps my drone in the air. The VC4SL's IR test is vital for high-drain applications. The 4900mAh batteries have very low internal resistance.
If you need 21700 batteries and a charger that tests them, this is it. No guesswork. The XTAR quality is evident. Batteries perform as rated.
The fast charge 3A on the VC4SL is no joke. With a QC3.0 brick, it fills these 4900mAh cells fast. The capacity grade gives accurate numbers.
My night vision device runs on 21700s. The VC4SL charges them safely and the IR test alerts me before a cell gets weak. Peace of mind.
Refund Policy
OneAndes Return & Refund Policy
At OneAndes, we are committed to providing high-quality cylindrical lithium-ion batteries for your drones, vacuums, garden tools, and other power needs. If you are not completely satisfied with your purchase, we are here to help. Please read our full return policy below before initiating a return.
1. Return Window
You have 30 calendar days from the date you received your item(s) to request a return. Any return request submitted after 30 days will not be eligible for a refund or exchange.
2. Eligibility Conditions
To qualify for a return, all items must meet the following conditions:
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Condition: Items must be unused, undamaged, and in the same condition that you received them.
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Packaging: Items must be returned in their original packaging with all accessories, manuals, and protective covers intact.
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Proof of Purchase: A valid receipt, order confirmation email, or proof of purchase must accompany all returns.
Non-Returnable Items:
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Batteries that have been installed, used, or show any signs of wear.
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Items marked as “Final Sale” or “Clearance” at the time of purchase.
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Customized or special-order products.
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Gift cards.
If a returned item fails to meet these conditions, we reserve the right to deny the return or charge a restocking fee.
3. How to Initiate a Return
Follow these steps to return your product:
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Contact Us: Email our support team at support@oneandes.com with your order number and the reason for return. We aim to respond to all return requests within 24 hours on business days.
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Receive RMA: We will provide you with a Return Merchandise Authorization (RMA) number and return instructions. Do not ship any item without an RMA number.
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Pack Securely: Place the item in its original packaging, include all accessories, and clearly write the RMA number on the outside of the box.
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Ship to Our US Warehouse: Ship the package to the following address:
OneAndes Returns
10320 6th St
Rancho Cucamonga, CA 91730
USA*Important: Lithium-ion batteries are classified as hazardous materials (Class 9). Please follow the shipping guidelines provided in Section 4 below. We recommend using a trackable shipping service and purchasing shipping insurance, as we cannot guarantee receipt of your returned item.*
4. Return Shipping Costs
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Defective or Incorrect Items: If the item you received is defective, damaged in transit, or different from what you ordered, OneAndes will cover the return shipping cost. In this case, we will provide you with a prepaid return shipping label.
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Buyer’s Remorse / Non-Defective Returns: If you are returning an item for any other reason (e.g., no longer needed, ordered the wrong model), you are responsible for the return shipping costs. You must prepay the return shipping cost using a trackable carrier that accepts lithium batteries. We do not provide prepaid return labels for non-defective returns.
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Lithium Battery Shipping Regulations: By law, all returns must be shipped in compliance with applicable dangerous goods regulations. We will provide guidance on proper packaging and labeling. Failure to comply may result in carrier refusal, seizure, or additional fees. We are not responsible for returned items lost or rejected by the carrier due to improper shipping.
5. Refunds
Once we receive and inspect your return at our Rancho Cucamonga, CA facility, we will notify you via email of the approval or rejection of your refund.
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Approved Refunds: If approved, your refund will be processed to your original method of payment within 5 to 10 business days. Please note that depending on your bank or credit card issuer, it may take additional time for the credit to appear on your statement.
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Partial Refunds: In certain situations, only partial refunds may be granted:
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Items not in original condition, missing parts, or damaged for reasons not due to our error.
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Items returned more than 30 days after delivery (reviewed on a case-by-case basis).
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Non-Refundable Fees: Original shipping charges are non-refundable unless the return is due to our error (defective product or incorrect shipment).
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Restocking Fee: We do not charge a restocking fee for defect-free returns, but we may deduct the return shipping cost, which will be deducted from your refund.
6. Exchanges
We replace items only if they are defective or damaged upon arrival. If you need to exchange a defective item for the same product, please contact us at support@oneandes.com. Exchanges are subject to product availability.
If you ordered the wrong battery size or model, please follow the standard return process above and place a new order for the correct item.
7. Damaged or Missing Items
If your package arrives visibly damaged, please take photos of the package before opening and contact us immediately. We will work with the shipping carrier to file a claim and arrange for a replacement or refund. Damaged or missing item claims must be reported within 7 calendar days of delivery. For immediate assistance, you may also call us at (213) 316-8849.
8. Order Cancellation
You may cancel your order without penalty if it has not yet been shipped. To cancel, email us at support@oneandes.com as soon as possible. If the order has already been processed or shipped, you will need to follow the standard return process upon receipt.
9. Warranty
All OneAndes batteries are backed by a 12-month limited warranty against defects in materials and workmanship. This warranty does not cover damage caused by misuse, improper charging, unauthorized modifications, normal wear and tear, or use outside of manufacturer specifications. For warranty claims, please contact our support team.
10. Contact Us
If you have any questions about our Return & Refund Policy, please reach out:
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Email: support@oneandes.com
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Phone: (213) 316-8849 (Mon-Fri, 9 AM – 5 PM Pacific Time)
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Mailing Address: 10320 6th St, Rancho Cucamonga, CA 91730, USA
We aim to respond to all inquiries within 24 hours during business days. Please include your order number for faster assistance.