XTAR VC4SL 4-Bay Smart Battery Charger | QC3.0 3A Fast Charge with Capacity & IR Test for 3.6V/3.7V Li-ion 18650 21700 and 1.2V Ni-MH AA AAA
Description
Product Description
The XTAR VC4SL is a high-performance 4-slot smart battery charger engineered for both everyday users and battery enthusiasts. Combining a user-friendly LCD interface with advanced charging algorithms, it supports 3A QC3.0 fast charging via a Type-C port. Going beyond basic charging, the VC4SL features professional-grade testing capabilities, including accurate Capacity Grading to reveal true battery health and Internal Resistance (IR) testing to identify aging cells. Its Storage Mode intelligently charges or discharges batteries to their optimal long-term storage voltage, effectively extending battery lifespan. With a flexible spring-loaded design, it safely accommodates 3.6V/3.7V Li-ion batteries (from 10440 to 32650) and 1.2V Ni-MH/Ni-CD batteries (AA/AAA/SC/C), ensuring a truly comprehensive charging station for all your power needs.
Key Features
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Advanced LCD Display Interface: Features a clear LCD screen that displays real-time charging progress, input capacity (mAh), charging current (mA), and internal resistance (mΩ) for all 4 slots simultaneously.
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QC3.0 3A Fast Charging: Equipped with a widely compatible Type-C port supporting QC3.0 input (9V/2A). Provides a powerful 3A single-slot fast charge for Li-ion batteries.
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Three Professional Battery Modes: Easily switch via the "Mode" button between Charging mode, Capacity Grading mode (a full charge-discharge-charge cycle to test true mAh capacity), and Storage mode.
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Built-in Internal Resistance Test: Can accurately measure the internal resistance (IR) of the battery. This feature helps users identify weak, aged, or damaged cells before they fail in critical devices.
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Ultra-Precise Voltage Control: Features a high-accuracy charging cut-off voltage of 4.20V ± 0.05V for Li-ion and 1.45V ± 0.1V for Ni-MH. The Storage mode automatically regulates the battery to an optimal 3.7V (Li-ion) or 1.2V (Ni-MH) storage voltage to prevent degradation.
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Extensive Battery Voltage Compatibility: The intelligent identification chip automatically recognizes 3.6V/3.7V lithium-ion batteries and 1.2V Ni-MH/Ni-CD batteries.
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Advanced Safety Protections: Implements a dedicated three-stage charging algorithm (Trickle-CC-CV) for Li-ion batteries. Features reverse polarity protection and an automatic stop when fully charged, with the screen flashing "FULL" to confirm.
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Portable and Compact Design: Features a streamlined, compact form factor measuring 156 x 115 x 35mm, weighing 212g. Includes a Type-C cable, manual, and premium travel storage pouch.
Product Parameters
General Specifications:
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Product Model: XTAR VC4SL
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Input Power: QC3.0 Type-C (9V/2A)
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Constant Charging Current: 3Ax1 / 2Ax2 / 1Ax4 / 0.5Ax4 / 0.25Ax4
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Charging Cut-off Current: ≤120mA
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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
Voltage Specifications:
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Input Voltage: 9V (QC3.0)
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Compatible Battery Voltage: 3.6V / 3.7V (Li-ion), 1.2V (Ni-MH/Ni-CD)
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Charging Cut-off Voltage: 4.20V ± 0.05V (Li-ion) / 1.45V ± 0.1V (Ni-MH)
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Optimal Storage Voltage: 3.7V (Li-ion), 1.2V (Ni-MH)
Supported Battery Types & Sizes:
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Supported Types: 3.6V / 3.7V Li-ion (IMR/INR/ICR) and 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/Ni-CD Sizes: AAA, AA, A, SC, C
Applications
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Professional maintenance and charging for high-performance EDC tactical flashlights and headlamps.
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Capacity sorting and testing for 18650/21700/26650 batteries used in RC drones and hobby electronics.
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Extending the life of 1.2V AA/AAA Ni-MH batteries commonly used in remotes, wireless mice, and digital cameras.
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Pre-conditioning batteries for storage in emergency kits, outdoor survival gear, and power banks.
Frequently Asked Questions (FAQ)
Q1: What is included in the package?
A1: The package includes 1x XTAR VC4SL Smart Charger, 1x Type-C Fast Charging Cable, 1x User Manual, and 1x Convenient Storage Pouch.
Q2: Can I charge protected 21700 batteries with the VC4SL?
A2: Yes. The VC4SL features an extendable spring-loaded battery bay specifically designed to accommodate protected 20700 and 21700 batteries safely and easily.
Q3: What exactly is the "Capacity Grading" mode?
A3: Capacity Grading mode runs a full cycle: the charger first charges the battery to full, then discharges it completely, and finally recharges it to full. This accurately measures the battery's real capacity (mAh), helping you discard aging batteries that no longer hold their rated charge.
Q4: What is the "Storage Mode" used for?
A4: If you do not plan to use a battery for a long period, the Storage Mode will automatically charge or discharge it to its optimal long-term storage voltage (3.7V for Li-ion, 1.2V for Ni-MH). Maintaining batteries at this specific voltage significantly prevents capacity loss and extends their overall lifespan.
Q5: How do I achieve the maximum 3A fast charging speed?
A5: To reach a 3A fast charging current, you must use a compatible QC3.0 (9V/2A) power adapter and charge only a single battery in one of the slots. The charger will automatically detect the input voltage and adjust the current accordingly.
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
I wish I'd bought this sooner. The VC4SL's grading mode helped me find a weak cell in my set. The display is easy to read. It's my daily driver now.
The 3A fast charge across 4 bays is incredible. The charger auto-selects the best current. The IR and capacity test features give peace of mind.
With the VC4SL, I finally have a system. I can grade, test, and charge all my cells. The bays are deep and take my longest protected 21700s.
I use the VC4SL for my AA and AAA Eneloops. It charges them gently and the capacity test confirmed they still hold 1900mAh. Very versatile.
I feel much safer charging my mech mod batteries on this. The IR monitoring indicates internal condition. The 3A charging is rapid without overheating.
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.