Description
What's in This Bundle
- 8x Samsung INR18650-25R, 2500mAh, Flat Top
- 1x XTAR VC8 8-slot LCD USB-C charger
- USB-A to USB-C charging cable and user manual included
A complete kit for anyone running an 8-cell high-drain device or building a larger pack — eight matched, genuine 25R cells paired with a charger built specifically for handling a full set like this, with independent circuitry per slot and real capacity diagnostics.
This listing is for Flat Top. Looking for Button Top? Click here to buy: Samsung INR18650-25R Button Top + XTAR VC8 Bundle.
Why This Pairing Makes Sense
The 25R is one of the classic high-drain 18650 cells — moderate capacity, a strong 20A continuous discharge rating, and a long track record in mods, RC applications, tools, and custom packs. Eight cells bought together as a matched set means consistent capacity and internal resistance across the whole group — the more cells you're combining into a pack, the more a single mismatched cell can drag down overall performance, so buying and verifying a matched set matters even more here than it does for smaller bundles. Flat Top is the standard terminal type for most current devices — DIY packs, tool battery builds, and equipment that doesn't rely on spring-loaded contacts.
The XTAR VC8 is built around eight fully independent charging circuits — XTAR describes each slot as functioning like its own small charger, so one slot's charging behavior doesn't affect the others. It also runs a genuine capacity-test (grading) mode on four of its eight slots, letting you verify real measured capacity and internal resistance rather than just trusting the printed rating — a genuinely useful check for a high-drain cell like the 25R, where mismatched internal resistance shows up fast under load.
Samsung 25R — Battery Specs
| Parameter | Value |
|---|---|
| Brand & Model | Samsung SDI INR18650-25R |
| Capacity | 2,500mAh standard discharge (2,450mAh rated at 10A) |
| Nominal Voltage | 3.6V |
| Full Charge Voltage | 4.2V |
| Discharge Cutoff Voltage | 2.5V |
| Max Continuous Discharge | 20A |
| Max Charge Current | 4A (standard charge: 1.25A) |
| AC Impedance | ≤18mΩ (1kHz, initial) |
| Terminal Type | Flat Top |
| Protection Circuit | None (unprotected cell) |
| Weight | 45g max |
This is a genuine high-drain cell, verified against Samsung's official datasheet — not rewrapped or relabeled stock. The 25R is often run close to its current ceiling in real devices, so heat management in your build matters more here than it would with a lower-drain cell.
This listing is for Flat Top. For Button Top click here
XTAR VC8 — Charger Specs
| Parameter | Value |
|---|---|
| Input | Type-C, QC3.0 (5V⎓2A / 9V⎓2A) |
| Charging Current (CC) | 3A×1 / 2A×2 / 1A×4 / 0.5A×8 / 0.25A×8 — adjustable, current per slot depends on how many slots are in use |
| Manual Current Gears | 250mA or 500mA with all 8 slots occupied; 1000mA with 4 slots occupied; up to 2000mA on CH1/CH8 specifically |
| Charging Method | TC-CC-CV 3-stage charging (trickle wake-up → constant current fast charge → constant voltage top-off) |
| Cut-off Voltage | 4.20V ±0.05V (Li-ion) / 1.45V ±0.1V (Ni-MH/Ni-Cd) |
| Cut-off Current | ≤120mA |
| Operating Temperature | 0°C to 40°C |
| Dimensions | L194mm x W134mm x H34mm |
| Net Weight | 350g |
| Display | Dual VA LCD screens showing real-time voltage, current, capacity, and internal resistance across all 8 slots |
| Special Modes | Capacity/grading mode (charge → discharge → recharge to verify true capacity) — available on CH1-CH4 only; storage mode (available across slots) |
| Compatible Cell Sizes | 3.6V/3.7V Li-ion: 10440, 14500, 14650, 16340, 17500, 17670, 18350, 18490, 18500, 18650, 18700, 20700, 21700, 22650, 25500, 26650. 1.2V Ni-MH/Ni-Cd: AAAA, AAA, AA, A, SC, C, D. Supports protected 20700/21700 cells |
| Extra Feature | "0V" activation — can recover some over-discharged cells |
| Safety | Overvoltage, overcurrent, short-circuit, overcharge, and reverse-polarity protection; real-time internal temperature monitoring for stable heat management during full 8-slot use |
| Certifications | RoHS, CE, FCC |
An important note on the grading/capacity test mode: only CH1 through CH4 support the charge-discharge-recharge capacity test — the other four slots (CH5-CH8) handle standard charging only. For a high-drain cell like the 25R where internal resistance consistency matters, plan to run your eight cells through CH1-CH4 in two batches of four if you want all of them tested.
A realistic note on charge time: with all 8 slots occupied, the VC8's default charging current is 0.5A per slot (adjustable down to 0.25A if you prefer an even gentler rate) — well under the 25R's 4A max charge rating, so there's real margin here. At 0.5A, a full charge for all eight 25Rs takes roughly 5.5-6 hours. CH1 and CH8 can individually push higher current (up to 2A or 3A) if you're not using all 8 slots at once.
Where the 25R Actually Shines
- RC applications — cars, planes, and similar hobbies that need real current delivery
- Power tools and custom packs where discharge capability matters more than maximum runtime per cell
- 8-cell robotics and DIY builds needing dependable, verified current under load across a larger set
Not the ideal pick if capacity or runtime matters more to you than raw discharge current — a cell like the 30Q or 35E will serve you better in that case.
Things Worth Knowing Before You Use This Kit
- The 25R is an unprotected cell. The charger enforces its own voltage and current cutoffs, but your device still needs to handle discharge-side protection.
- Don't mix these cells with older ones you already own, even if they're also 25R — run a batch through CH1-CH4's grading mode first if you want to check consistency before combining.
- Flat Top won't work in devices that specifically require Button Top cells — check your device's battery compartment before ordering if you're not sure which terminal type it needs.
- Only CH1-CH4 support capacity grading. Keep that in mind if you're planning to test all eight cells before a pack build.
- This cell runs warm at its rated ceiling. That's expected behavior for a 20A cell pushed toward that limit, not a defect — but ventilation and enclosure design in your build matter.
Frequently Asked Questions
Can all 8 cells charge at once? Yes — all 8 slots operate independently and can charge simultaneously, though the per-slot current drops to 0.5A (or less) when all 8 are occupied, compared to higher rates available with fewer slots in use.
Can this charger test the real capacity of all 8 cells? Only four at a time. CH1-CH4 support the grading (capacity test) mode; CH5-CH8 handle standard charging only. Run your first four cells through CH1-CH4, then swap in the remaining four for a second round if you want all eight tested — genuinely worthwhile for a high-drain cell where resistance mismatches show up fast under load.
Will Flat Top cells work in my device? If your device uses spring-loaded, flat, or magnetic-style contacts without a raised positive terminal requirement, Flat Top is the correct choice. If your device specifically calls for Button Top (a raised positive terminal), you'll want that version instead.
Does this charger work with rechargeable AA/AAA batteries too? Yes — the VC8 automatically detects Ni-MH/Ni-Cd chemistry and applies the appropriate charging strategy alongside Li-ion cells, across sizes from AAAA up to D and C.
Is this kit protected-cell compatible? The VC8 supports protected 20700/21700 cells if you use it for those later. The Samsung 25R cells included in this bundle are unprotected bare cells, which is standard for this model.
In stock now. This bundle ships as a matched set of eight genuine Samsung 25R Flat Top cells with a verified XTAR VC8 charger — independent 8-slot charging with real capacity diagnostics, ready for larger high-drain builds out of the box.
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
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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.