NITECORE UM4 4-Slot USB-C Smart Battery Charger - 1500mA Fast Charge with LCD Display, Internal Resistance Test & IMR Repair for Li-ion, IMR, LiFePO4, NiMH & NiCd Batteries (Includes Type-C Cable)
Description
【Product Description】
Experience the pinnacle of smart battery charging with the NITECORE UM4. Designed for professionals and battery enthusiasts, the UM4 is a 4-slot intelligent charger that goes far beyond simply topping up your cells.
Featuring a crystal-clear high-definition LCD display, the UM4 provides real-time data for all four slots, including charging current, voltage, battery capacity, and even a professional internal resistance health check. It intelligently analyzes your batteries and displays "Good" or "Poor" based on internal resistance, letting you instantly spot weak or faulty cells that need to be replaced.
Charging at a blazing 1500mA per slot (3000mA total in QC mode), the UM4 can bring a 3500mAh battery to 80% in just 2 hours! With its proprietary IMR Battery Repair Mode and 0V Activation, it can safely revive over-discharged IMR cells that other chargers reject. By long-pressing the C button, you can manually switch between 3.7V, 4.2V, 4.35V, and 3.2V (LiFePO4) voltage modes to perfectly match your specific battery chemistry.
Powered by a modern USB-C port, it can be energized by wall adapters, power banks, or solar panels, making it the ultimate travel-ready charging station.
( IMPORTANT: This listing includes the charger and USB-C cable. Rechargeable batteries are NOT included.)
【Key Features】
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1500mA Ultra-Fast Charging: Delivers a massive 1500mA per slot (3000mA total with QC adapter), charging a 3500mAh Li-ion battery to 80% in just 2 hours—7 times faster than standard chargers.
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Professional Battery Health Check: The LCD screen monitors internal resistance in real-time and displays "Good" or "Poor", helping you instantly identify degraded or aging cells.
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High-Definition LCD Display: Crystal-clear screen shows real-time charging mode, voltage, current, charged capacity, and battery type for each of the 4 independent slots.
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Multi-Chemistry & Voltage Support: Automatically detects 3.6V/3.7V Li-ion, IMR, 1.2V NiMH, and NiCd. Manual selection supports 4.35V high-voltage cells and 3.2V LiFePO4 batteries.
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IMR Battery Repair & 0V Activation: If you insert an over-discharged IMR battery, the screen will display "EE EE" prompting you to long-press the V button to enter Repair Mode. This revives dead batteries safely.
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Reverse Polarity & Short Circuit Protection: The built-in intelligent chip detects improper insertion or short circuits, flashing "EE" on the screen to alert you instantly.
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Universal USB-C Input: Powered by any standard 5V/2A+ wall adapter, power bank, or solar panel, making it perfect for home, travel, and outdoor use.
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Energy-Saving LCD & Flame-Retardant Shell: The LCD screen automatically dims after 3 minutes to save power, and the sturdy PC flame-retardant casing ensures complete safety in complex environments.
【Parameters & Specifications】
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Brand: NITECORE
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Model: UM4
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Input: 5V=2A / QC (9V or 12V) (USB-C)
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Output Current: 3000mA (Max Total) / 1500mA (Max Single Slot)
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Charging Modes: CC / CV / -dV/dt
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Compatible Chemistries: Li-ion (3.6V/3.7V), IMR, LiFePO4 (3.2V), NiMH (1.2V), NiCd (1.2V)
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Compatible Sizes: 10440, 14500, 14650, 16340, 17500, 17670, 18350, 18490, 18500, 18650, 18700, 20700, 21700, 22650, 25500, 26650
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LCD Display: Real-time voltage, current, capacity, internal resistance, and battery type
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Dimensions: 143mm × 103mm × 45mm
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Weight: 195g (Without cable and batteries)
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Package Content: UM4 Charger, USB-C Cable, User Manual
【Applications】
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Professional Battery Tester: Quickly assess battery health via internal resistance (Good/Poor).
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Outdoor Enthusiasts: Charge via power banks and solar panels using the USB-C input.
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Vape & Flashlight Users: Fast-charging high-drain 18650/21700 Li-ion cells.
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High-Voltage Specialists: Perfect for 4.35V high-voltage cells and 3.2V LiFePO4 batteries.
【Frequently Asked Questions (FAQ)】
Q1: Does this charger come with batteries?
A1: NO. The NITECORE UM4 includes the charger and a USB-C cable. Batteries are sold separately.
Q2: How does the internal resistance test work?
A2: After inserting the battery, the charger automatically measures its internal resistance. If it is below 250mΩ, it shows "Good". If it exceeds 250mΩ, it shows "Poor", indicating a degraded or unhealthy cell.
Q3: How do I charge a 4.35V or LiFePO4 battery?
A3: Long-press the "C" button to enter the setup mode. Use the "V" button to manually cycle through 3.7V, 4.2V, 4.35V, and 3.2V (LiFePO4) options, and confirm your selection.
Q4: What does "EE EE" mean on the screen?
A4: "EE EE" indicates that the battery is over-discharged (0V) or inserted in reverse. For over-discharged IMR batteries, long-press the "V" button to enter the IMR Repair Mode to safely revive it.
Q5: Can I use it to charge my 21700 batteries?
A5: Yes, the UM4 features wider slots that perfectly accommodate 21700 and 26650 batteries, including those with protection boards.
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.