XTAR VC4 4-Bay Smart Battery Charger | LCD Gauge Display for 3.6V/3.7V Li-ion 18650 21700 & 1.2V Ni-MH AA AAA Batteries
Description
Product Description
The XTAR VC4 is a versatile and reliable 4-slot smart battery charger designed for both lithium-ion and nickel-metal hydride batteries. Featuring an innovative LCD gauge-style screen, it provides real-time, precise monitoring of charging status, battery voltage, charging current, and capacity. The charger supports independent four-slot charging, allowing you to mix Li-ion and Ni-MH batteries simultaneously. Equipped with XTAR's original 0V activation technology, it can revive over-discharged batteries. With robust safety protections like reverse polarity detection and automatic shut-off upon full charge, the VC4 offers a worry-free charging experience for your daily electronic devices.
Key Features
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Innovative LCD Gauge Screen: Displays key real-time data including battery voltage, charging current gear, battery capacity (mAh), slot number, and battery type at a glance.
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Intelligent 0V Activation: XTAR's original 0V activation feature safely revives batteries that have been over-discharged to low voltage, restoring them to a usable state.
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Independent Four-Slot Design: Each slot operates independently, supporting mixed charging of 3.6V/3.7V Li-ion and 1.2V Ni-MH/Ni-CD batteries without interference.
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Clear Safety Warnings & Auto Stop: The LCD screen clearly displays intuitive warnings: "Full" when fully charged, "null" if the battery is damaged, and "Err" if the battery is reversed. Charging automatically stops when fully charged.
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Extensive Battery Compatibility: Supports 3.6V/3.7V Li-ion batteries (10440 to 32650) and 1.2V Ni-MH/Ni-CD batteries (AAAA to D size). Note: It does not support protected 20700 and 21700 batteries.
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Comfortable User Experience: Features a simple one-button operation to view charging status. Long press the button for 1.5 seconds to turn off the screen backlight for low-light environments.
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Three-Stage Charging Algorithm: Utilizes a lifespan-optimized charging process (Trickle-CC-CV) for Li-ion batteries and a smart pulse charging process for Ni-MH batteries to ensure efficient and safe charging.
Product Parameters
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Product Model: XTAR VC4
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Input Power: DC 5.0V 2.1A (USB power supply)
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Charging Current Options: 0.5A (500±50mA) / 1.0A (1000±80mA)
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Charging Cut-off Voltage: 4.20V ± 0.05V (Li-ion) / 1.45V ± 0.1V (Ni-MH)
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Operating Temperature: 0 - 40°C
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Dimensions: L149 x W115 x H35 mm
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Net Weight: 210g
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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
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Supported Ni-MH/Ni-CD Sizes: AAAA, AAA, AA, A, SC, C, D
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Important Note: Cannot charge protected 20700 and 21700 batteries.
Applications
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Daily charging and maintenance of 3.6V/3.7V 18650 batteries for EDC flashlights and headlamps.
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Safe power replenishment for standard AA and AAA Ni-MH batteries used in remote controls, wireless mice, and digital cameras.
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Mixed battery charging for hobbyists managing both Lithium and Ni-MH power sources.
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Reviving and testing old or over-discharged batteries for emergency kits and outdoor gear.
Frequently Asked Questions (FAQ)
Q1: What is the maximum charging current of the XTAR VC4 charger?
A1: The XTAR VC4 offers two selectable charging current options: 0.5A (500mA) and 1.0A (1000mA). It supports up to 1A per slot when charging four batteries simultaneously.
Q2: What do the error messages on the LCD screen mean?
A2: The VC4 provides clear safety feedback via the LCD screen. "Full" means the battery is completely charged; "null" indicates the battery is damaged or cannot hold a charge; "Err" indicates you have inserted the battery with reversed polarity, which triggers automatic protection to stop charging immediately.
Q3: Can I charge a Li-ion battery and a Ni-MH battery at the same time?
A3: Yes. The VC4 features a completely independent 4-slot design. You can safely mix Li-ion batteries and Ni-MH/Ni-CD batteries in any slot without impacting charging performance.
Q4: Does the VC4 support charging protected 21700 batteries?
A4: No. According to the manufacturer's design, the XTAR VC4 does not support protected 20700 and 21700 batteries. Please be sure to check your battery specifications before use.
Q5: How does the 0V activation function work?
A5: If your lithium battery has been over-discharged to an extremely low voltage (near 0V) and cannot be charged by standard chargers, the VC4's 0V activation feature will attempt to apply a safe, low current to revive and reactivate the battery's internal protection circuit, often restoring it to a usable state.
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 VC4 is perfect for someone getting into li-ion cells. The display is helpful, the bays are spacious. It automatically selects current. No complaints.
I keep coming back to this model. It's simple, works, and doesn't overcharge. The LCD gauge is a classic design. I trust XTAR.
The VC4 shows voltage to two decimals and it matches my multimeter. The springs hold batteries tight. Perfect for my growing collection.
I love that there's no fan. The passive cooling works fine. The capacity display is a nice touch to compare cells. Works with my 21700s.
I charge my AA and AAA alongside 18650s. The VC4 recognizes them and applies the correct algorithm. The display is bright, easy to see.
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.
