NITECORE UM2 2-Slot Smart Battery Charger with LCD Display – QC/PD Fast Charging for 18650, 21700, 26650 Li-ion Batteries
Description
Product Description
The NITECORE UM2 is a premium intelligent dual-slot USB-C battery charger designed for safety, speed, and versatility. Whether you are a professional flashlight user, an outdoor enthusiast, or a DIY electronics builder, the UM2 delivers unparalleled charging performance.
Equipped with a high-definition LCD display, the UM2 allows you to monitor real-time charging status, including battery voltage, charging current, charged capacity, and elapsed time. It supports QC 2.0 fast input and provides a maximum output of 1500mA per slot (3000mA total).
The UM2 is not just a charger—it’s a battery life saver. It features IMR battery repair and activation functions, helping you revive over-discharged lithium batteries. With multiple safety protections, including reverse polarity, short-circuit prevention, and a built-in intelligent temperature control system, your batteries are always in safe hands.
Key Features
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Intelligent Dual-Slot Charging: Two independent charging slots with a total output of 3000mA (1500mA per slot).
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High-Definition LCD Display: Real-time monitoring of charging current, voltage, capacity, and time. The screen automatically dims after 10 minutes to save power.
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QC 2.0 Fast Charging: Supports Quick Charge 2.0 input for significantly reduced charging times.
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Battery Activation & Repair: Automatically detects and activates over-discharged IMR/Li-ion batteries. Displays "EE" when a battery is beyond repair.
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3 Charging Modes: Automatically selects CC (Constant Current), CV (Constant Voltage), and -dV/dt (for NiMH/NiCd) modes based on battery chemistry.
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Manual Setting: Long-press the "C" button to manually adjust charging voltage (3.7V/4.2V/4.3V) and current (100mA ~ 1500mA).
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USB-C Input: Powered via USB-C, compatible with power banks, solar panels, USB adapters, and laptops.
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Advanced Safety Protection: Features reverse polarity protection, short-circuit protection, overcharge cut-off, and full-automatic smart temperature control.
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Unique Heat Dissipation Design: Built-in cooling fins on both sides ensure stable charging by preventing heat buildup.
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Fire-Resistant Material: Manufactured with PC flame-retardant materials for maximum safety.
Parameters (Specifications)
| Parameter | Specification | ||
|---|---|---|---|
| Input Voltage | DC 5V/2A, 9V/2A (QC 2.0) | ||
| Input Power | 18W (Max) | ||
| Output Voltage | 4.35V ±1% / 4.2V ±1% / 3.7V ±1% / 1.48V ±1% | ||
| Output Current | Fast Charge Mode: 1500mA × 2 (Max) | ||
| Standard Mode: 1000mA × 2 (Max) | Compatible Batteries (Li-ion) | 3.6/3.7V IMR/Li-ion/3.2V LiFePO4: 10440, 14500, 14650, 16500, 16340, 16650, 17350, 17500, 17650, 17670, 17700, 18350, 18490, 18500, 18650, 18700, 20700, 21700, 22500, 22650, 25500, 26500, 26650, 26700 | Compatible Batteries (NiMH/NiCd) | 1.2V AA, AAA, AAAA, C, D | Dimensions | 152mm × 73mm × 40mm (5.98" × 2.87" × 1.57") |
| Weight148.3g (5.23oz) (Without charging cable) |
Applications
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Everyday Carry (EDC): Perfect for charging 18650 and 21700 batteries used in high-performance flashlights and headlamps.
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Outdoor Adventures: USB-C input allows you to charge batteries via solar panels or power banks during camping, hiking, or emergency situations.
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DIY Electronics & Power Banks: Ideal for hobbyists building custom battery packs or using NiMH/NiCd cells for RC devices.
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Industrial & Professional Use: Reliable charging for cordless power tools, security cameras, and medical devices.
FAQ
Q1: What is the difference between Fast Charge Mode and Standard Mode?
A: In Fast Charge Mode, the UM2 outputs 1500mA per slot for faster charging (up to 18W total). In Standard Mode, it outputs 1000mA per slot, which is gentler on batteries and suitable for overnight charging.
Q2: What does the "EE" error display mean?
A: The "EE" display indicates that the battery is either damaged, has a short circuit, or is over-discharged beyond the safe repair threshold. For over-discharged IMR batteries, you can long-press the "V" button to attempt repair mode.
Q3: Can I charge NiMH and Li-ion batteries at the same time?
A: Yes, the UM2 has two independent slots. You can charge different battery chemistries (Li-ion, NiMH, NiCd) simultaneously without interference.
Q4: Does the UM2 support USB-C to USB-C charging?
A: Yes, the UM2 uses a USB-C port. You can power it using a standard USB-C cable connected to a compatible QC 2.0 wall adapter, power bank, or laptop.
Q5: How long does it take to charge a 3500mAh battery?
A: In Fast Charge Mode (1500mA), charging a 3500mAh battery to 80% takes approximately 2 hours.
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.