XTAR DRAGON VP4L Plus 4-Slot Smart Battery Charger & Tester - LCD Display with Internal Resistance Test, 11.1V 3S Battery Pack Charging & Capacity Testing for Li-ion, IMR, NiMH & NiCd (Complete Pro Kit)
Description
【Product Description】
Meet the “Personal Doctor” for your batteries. The XTAR DRAGON VP4L Plus 4-Slot Smart Battery Charger & Tester is a professional-grade powerhouse that transcends ordinary charging. It combines a high-definition LCD display, precision internal resistance testing, capacity grading, and advanced battery pack charging into one sophisticated unit, making it the ultimate tool for enthusiasts, RC hobbyists, and professional technicians.
Equipped with a pair of precision test probes, the VP4L Plus works like a digital multimeter, allowing you to instantly test the internal resistance (mΩ) and voltage of any cylindrical Li-ion, IMR, NiMH, or NiCd battery. A lower internal resistance means healthier, higher-discharge capacity. It also features a TEST mode (Charge → Discharge → Charge) that accurately grades your battery's true capacity, and a REFRESH mode designed to eliminate NiMH/NiCd memory effects.
Beyond single cells, the DRAGON VP4L Plus uniquely supports 11.1V 3S battery packs via a built-in 4-Pin socket, making it an indispensable tool for drones, RC vehicles, and DIY power tools. It supports charging 0V activation, auto-stop at full charge, and up to 2.0A charging current per slot.
Complete Pro Kit Included: Charger, User Manual, 3A Car Adapter, Precision Test Probes, 12V/3A Power Adapter, and a Premium Storage Bag. Everything you need for professional battery maintenance, right out of the box!
【Key Features】
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Built-In Internal Resistance Tester (Multimeter Function): Comes with precision test probes. Test the real resistance (mΩ) and voltage of batteries to instantly assess battery health and performance.
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11.1V 3S Battery Pack Charging: Featuring a dedicated 4-Pin balancing port, this charger can safely and evenly charge 3S battery packs (standard 1A charging current), perfect for RC vehicles and DIY electronics.
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Professional LCD Display & Record Function: High-definition screen shows real-time current, voltage, capacity percentage, and battery type. The Record function stores up to 64 test results for easy comparison.
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TEST Mode (Capacity Grading): Automatically runs a Charge → Discharge → Charge cycle to measure accurate real capacity (mAh), helping you identify fake, old, or degraded cells.
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REFRESH Mode (Battery Revival): Uses discharge-charge cycling to effectively eliminate the memory effect in NiMH/NiCd batteries, restoring their full usable capacity and extending their lifespan.
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0V Activation & Adjustable Current: Automatically revives over-discharged (0V) batteries. Choose from 0.5A / 1.0A / 2.0A currents to suit different battery sizes.
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Complete Pro Kit: Includes a 12V/3A AC adapter, 3A car charger, precision probes, and a premium carrying bag, ready for use at home or on the road.
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Comprehensive Safety Protection: Intelligent temperature control, 20-hour auto shut-off, reverse polarity protection, and precise cut-off to prevent overcharging.
【Parameters & Specifications】
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Brand: XTAR
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Model: DRAGON VP4L Plus
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Input: DC 12V 3A (Power Adapter or Car Adapter included)
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Adjustable Current (Constant) : 0.5A (500±50mA) / 1.0A (1000±80mA) / 2.0A (2000±120mA)
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Charge Cut-off Voltage: 4.20V ±0.05V / 1.45V ±0.1V
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Activation Current: 100mA
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Trickle Charging Current: 50±10mA / 100±20mA / 200±20mA
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Auto Recharge Voltage: 3.90V ±0.15V
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0V Activation Range: 0.2-0V
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Operating Temp: 0℃ ~ 40℃
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Dimensions: 158mm × 147mm × 40mm
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Weight: 365g (Without batteries & adapter)
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Compatible Chemistries: 3.6V/3.7V Li-ion (IMR/INR/ICR), 1.2V NiMH/NiCd, 11.1V 3S Battery Packs
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Compatible Sizes: 10440, 14500, 14650, 16340, 17335, 17500, 17670, 18350, 18490, 18500, 18650, 18700, 20700 (with/without protection), 21700, 22650, 25500, 26650, 32650, plus AAAA/AAA/AA/A/SC/C/D NiMH/NiCd.
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Package Content: Charger, User Manual, 3A Car Adapter, Test Probes, 12V/3A Adapter, Storage Bag.
【Applications】
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RC Hobbyists: Charging and balancing 3S LiPo/Li-ion packs for drones and RC cars.
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Battery Enthusiasts & Testers: Measuring internal resistance to grade 18650/21700 cells for custom battery packs.
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Technicians & Repair Shops: Quickly testing the health of rechargeable batteries for flashlights, vape mods, and power tools.
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Household Maintenance: Reviving and refreshing old NiMH AA/AAA batteries in remote controls and emergency lights.
【Frequently Asked Questions (FAQ)】
Q1: What is the purpose of the test probes?
A1: The probes work like a digital multimeter. You can touch them to the positive and negative ends of a battery to instantly test its precise internal resistance (mΩ) and voltage. This helps you determine if a battery is healthy, aging, or a poor-quality counterfeit.
Q2: Can I use this charger to charge my RC car's 3S battery?
A2: Yes! The DRAGON VP4L Plus features a built-in 4-Pin balancing socket. It can safely charge a standard 11.1V 3S battery pack with a fixed 1A current, ensuring all three cells are balanced and fully charged.
Q3: What does TEST mode do?
A3: It activates a precise “Charge → Discharge → Charge” cycle. By measuring the total discharge capacity, the charger tells you the true mAh capacity of your battery, allowing you to compare it to the label and see if you’ve been sold a fake or a degraded cell.
Q4: Can it revive dead batteries?
A4: Yes. The charger features 0V Activation technology. If a battery has been over-discharged to 0V, the VP4L Plus will detect it and apply a small 100mA activation current to try and bring it back to life. If the battery has physical damage, it will alert you with a red indicator.
Q5: What is the difference between TEST and REFRESH mode?
A5: TEST is mainly for Li-ion batteries to measure true capacity. REFRESH is designed for NiMH/NiCd batteries to perform a deeper discharge-recharge cycle, which eliminates “memory effect” and restores their maximum usable capacity.
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

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.
