Samsung 25R 2500mAh 20A Button Top Battery 2-Pack with Nitecore UM2 Smart Charger – High-Drain Power Kit for Flashlights, and Cordless Tools
Description
What’s in This Bundle:
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2x Samsung 25R 2500mAh 20A Button Top Batteries – Factory-fresh, high-drain 18650 cells.
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1x Nitecore UM2 Intelligent Dual-Slot Charger – Smart charging with LCD display and QC 2.0 fast input.
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1x USB-C Charging Cable – Ready to plug into wall adapters, power banks, or laptops.
(Note: This kit does not include an AC wall adapter.)
Product Description:
Most 18650 batteries can't handle serious punishment. The Samsung 25R is the exception. For years, it's been the go-to choice for enthusiasts and tradespeople who refuse to compromise on power delivery. It delivers a rock-solid 20A continuous discharge, which means your high-wattage tactical flashlight, or cordless tool gets consistent current without performance drops.
This kit pairs two factory-fresh 25R button-top cells with the Nitecore UM2 charger. The UM2 is more than a simple power brick. It uses a smart chip to automatically detect battery chemistry, then applies the ideal charging profile. The bright LCD screen gives you real-time readings on voltage, current, and capacity, so you know exactly what's happening.
It supports QC 2.0 fast input, pushing up to 1500mA into each slot. That means a 3500mAh battery hits 80% charge in just over two hours. There's also an IMR-optimized program that keeps high-current cells running at their peak, plus an over-discharge repair function that can revive batteries you'd otherwise toss.
You get a power solution that actually works, day after day.
Key Benefits:
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20A continuous output – Real, sustained power for demanding electronics.
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Up to 35A pulse burst – Handles short-duration power spikes without breaking a sweat.
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Fast QC 2.0 charging – 1500mA per slot means less waiting.
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Smart battery detection – The UM2 reads your battery and picks the right charge curve automatically.
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LCD status screen – Check voltage, current, and capacity in real time.
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Repair mode included – Revives over-discharged or deeply drained cells.
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Full safety suite – Reverse polarity, short-circuit, and heat protection all built-in.
Technical Specifications:
Battery - Samsung 25R (Button Top):
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Brand: Samsung SDI
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Model: INR18650-25R
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Capacity: 2500mAh
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Voltage: 3.6V / 3.7V
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Continuous Discharge: 20A
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Pulse Discharge: Up to 35A (short bursts only)
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Standard Discharge: 10A (for longer cycle life)
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Internal Resistance: ≤18mΩ
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Chemistry: Li-ion NMC
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Cut-Off Voltage: 2.5V
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Operating Temp (Discharge): -20°C to 75°C
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Cycle Life: 250+ cycles at 20A
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Weight: 45g
Charger - Nitecore UM2:
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Input: DC 5V/2A, 9V/2A (QC 2.0)
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Max Output: 1500mA per slot
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Total Output: 3000mA
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Display: LCD (voltage, current, capacity)
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Protection: Reverse polarity, short-circuit, overheat, over-charge
Complete Battery Compatibility List:
| Battery Type | Supported Models | Voltage |
|---|---|---|
| Li-ion / IMR | 10440, 14500, 14650, 16500, 16340 (RCR123), 16650, 17350, 17500, 17650, 17670, 17700, 18350, 18490, 18500, 18650, 18700, 20700, 21700, 22500, 22650, 25500, 26500, 26650, 26700 | 3.6V / 3.7V / 4.35V |
| LiFePO4 | (All compatible Li-ion sizes above) | 3.2V |
| Ni-MH / Ni-Cd | AA, AAA, AAAA, C, D | 1.2V |
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Dimensions: 152mm × 73mm × 40mm
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Weight: 148.3g
Applications:
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High-wattage and rebuildable atomizers
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High-lumen tactical flashlights and searchlights
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Cordless drills, impact drivers, and rotary tools
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High-torque RC cars and drones
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Portable power stations and battery banks
Frequently Asked Questions (FAQ):
Q1: What's the real-world difference between 20A continuous and 35A pulse?
A: The 20A rating is the safe, long-term current you can pull without damaging the cell. The 35A rating is what the battery can deliver in short, milliseconds-long bursts—like pressing a high-wattage fire button or starting a motor. You shouldn't run it at 35A continuously; that would overheat the cell and shorten its life. Treat it as a 20A battery and you'll be fine.
Q2: Can I use the UM2 charger with LiFePO4 batteries?
A: Yes. The UM2 automatically detects LiFePO4 cells and switches to the correct 3.2V charge profile. No manual setup is required.
Q3: What should I do if the charger shows "EE EE" on the screen?
A: That's the charger's way of saying it found a battery that's been over-discharged or is possibly damaged. The UM2 has a built-in repair mode—just press and hold the "V" button to try to revive a deeply drained cell.
Q4: Can I charge different battery sizes at the same time?
A: Absolutely. The UM2 has two independent slots, so you can charge an 18650 in one slot and a 21700 in the other without any issues. Check the compatibility list above to ensure both sizes are supported.
Q5: Can I power the UM2 from a power bank or solar panel?
A: Yes. The USB-C input makes it compatible with wall adapters, power banks, car chargers, and even portable solar panels—ideal for field use or road trips.
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
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Security
Two 25R 20A 2500mAh cells and UM2 charger. Perfect for my daily rotation.
Two powerful button tops and a smart 2-slot charger. My tools love these cells.
Samsung 25R are consistent performers. Nitecore UM2 is a solid smart charger.
Always have a charged 20A cell for my mod or tool. UM2 display is informative.
Two Samsung 25R and Nitecore UM2. Safe, powerful, and very informative display.
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.