Description
Key Features
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Exceptional Capacity: 3500mAh typical (3350mAh minimum) keeps your flashlights, headlamps, and portable fans running significantly longer between charges.
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Stable 8A Continuous Discharge: Supplies reliable current for mid-power applications up to 8 amps; ideal for regulated bike lights, and DIY power banks with moderate draw.
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Genuine Samsung Grade-A Cells: 100% authentic INR18650-35E produced by Samsung SDI, with original factory QC, zero-cycle freshness, and no rewraps or reclaimed cells.
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Long Cycle Life: Achieves ≥500 charge/discharge cycles (to 70% remaining capacity) under standard conditions, minimizing replacement frequency and total cost of ownership.
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Flat Top for Pack Building: Perfectly flat positive terminal simplifies series/parallel stacking and nickel strip spot-welding, ensuring low-contact-resistance assembly.
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High Energy Density: Approx. 250 Wh/kg; carry more energy without adding bulk or weight, essential for portable and wearable devices.
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Integrated Safety Mechanisms: Built-in CID (Current Interrupt Device), PTC thermistor, and vent disk offer multiple layers of passive protection under abusive conditions.
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No Memory Effect: Li-ion chemistry allows partial charging/discharging at any time without capacity loss, delivering maximum convenience.
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Free Shipping Included: The 4-pack ships for free, making it risk-free to try or restock. Fast processing and fully trackable delivery.
This is flat‑top| Needbutton‑top? Click here
Parameters
| Parameter | Specification |
|---|---|
| Model | INR18650-35E |
| Manufacturer | Samsung SDI |
| Typical Capacity | 3500mAh (at 0.2C discharge) |
| Minimum Capacity | 3350mAh |
| Nominal Voltage | 3.6V |
| Charge End Voltage | 4.20V ±0.05V |
| Discharge Cut-off Voltage | 2.65V |
| Max Continuous Discharge | 8A |
| Max Pulse Discharge | 13A (short pulse) |
| Standard Charge Current | 0.5C (1700mA) |
| Max Charge Current | 1C (3350mA, 0.5C recommended for longevity) |
| Internal Resistance (AC 1kHz) | ≤25mΩ (fresh cells typically 18–22mΩ) |
| Cycle Life | ≥500 cycles (0.5C charge / 1C discharge, to 70% capacity) |
| Chemistry | Li-ion NCA (Nickel Cobalt Aluminum Oxide) |
| Positive Terminal | Flat Top |
| Protection Circuit | None (unprotected cell) |
| Diameter (max) | 18.33mm |
| Height (max) | 64.85mm |
| Weight (approx. per cell) | 50g |
| Charge Temperature Range | 0℃ to 50℃ (32°F to 122°F) |
| Discharge Temperature Range | -20℃ to 60℃ (-4°F to 140°F) |
| Storage Temperature (1 month) | -20℃ to 50℃ |
| Storage Temperature (3 months) | -20℃ to 45℃ |
| Recommended Storage Voltage | 3.6V–3.7V (~40–60% SOC) |
| Package Contents | 4 x Samsung 35E 18650 flat top batteries |
| Shipping | Free shipping: 8-17 business days to US (tracking included). |
Applications
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Flashlights & Headlamps: Enjoy remarkably extended runtime on high-output 18650 torches, searchlights, and headlamps. Flat top fits most spring-loaded or dual-spring battery tubes.
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DIY Power Banks & USB Chargers: Combine these four cells inside a 1S4P power bank enclosure to create a massive 14,000mAh portable charger for camping, travel, or emergency preparedness.
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Power Tool Battery Rebuilds: Revive old cordless drill, impact driver, or handheld vacuum battery packs by spot-welding flat top 35E cells into the existing cluster with a compatible BMS.
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E-Bike / E-Scooter / Solar Storage: In 10S, 13S or other series configurations, the 35E cells serve as high-capacity energy storage for light electric vehicles, home solar banks, and UPS backups (professional assembly and balance BMS required).
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Solar Garden & Security Lights: Consistent discharge performance over a wide temperature range and long cycle life make them perfect for outdoor solar-recharged lighting.
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Medical & Industrial Devices: Stable voltage output suits portable monitors, infusion pumps, handheld meters, and data loggers that demand dependable, long-lasting power.
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RC Transmitters & Wireless Gadgets: Upgrade your radio controller battery bay or power wireless cameras, sensors, and robots with confidence.
- ⚠️ Compatibility Check: This is a Flat Top cell. If your device requires a Button Top (like some flashlights or mods with a recessed positive terminal), this battery will not work. Please check your device manual before ordering. (We also offer a Button Top version).
Assembly Warning: Never solder directly onto battery terminals. Pack assembly must be performed with a spot welder using pure nickel strips, and a matching Balance Management System (BMS) must be used for series connections. Unprotected cells must not be used in devices without integrated overcharge/over-discharge protection.
FAQ
1. Are these protected batteries? What’s the terminal type?
No, these are flat top unprotected cells without any built-in protection PCB. The positive terminal is flush with the battery can. They require an external protection circuit or should be used in devices that have built-in low-voltage/overcurrent safeguards.
2. Is the 3500mAh capacity real? What capacity can I expect in actual use?
Absolutely. The typical capacity is 3500mAh down to 2.65V under 0.2C load. Real-world devices usually cut off around 3.0V–3.2V, so usable capacity will be slightly less—often around 3300mAh–3400mAh—but still tops among high-capacity 18650s. Minimum capacity is guaranteed above 3350mAh.
3. Why flat top instead of button top?
Flat tops allow optimal contact when stacking cells in battery packs, especially for spot welding. They also fit snugly in flat-contact battery bays. If a device requires a button top, you may cautiously use a neodymium magnet spacer, but beware of the risk of short circuit if the magnet shifts.
4. What charger should I use?
Use a quality lithium-ion charger from brands like XTAR, Nitecore, Gyrfalcon, or Efest with CC/CV algorithm, accurate 4.2V termination, and reverse-polarity protection. Charge at 0.5C (1700mA) for best lifespan; occasional 1C (3350mA) is acceptable.
5. Are the 4 cells matched for capacity and internal resistance?
This pack provides cells from the same batch with consistent voltage, but does not include precision matching service. For series packs, a balancing BMS is strongly recommended. If you need closely matched cells for professional builds, please reach out to us for a custom matching quote.
6. Do I need to charge them upon arrival? How to store them?
Samsung ships cells at approximately 3.6V (40–50% state of charge), which is ideal for storage. You can use or store them immediately. For prolonged storage, keep them in a cool, dry place (around 20°C / 68°F) and top up to 3.6–3.7V every 6–12 months to prevent over-discharge.
7. How do I know these are authentic Samsung cells?
We guarantee authentic Samsung SDI INR18650-35E cells. Genuine cells feature crisp heat-shrink wrap printing, embossed ring on the positive cap, and a slightly raised, laser-etched model code. Counterfeit cells often have blurry text, absent vent features, or different weight. Full refund if proven otherwise.9. Can I solder wires directly to the battery?
Absolutely not! Soldering transfers dangerous heat into the cell, damaging the internal separator, safety vent, and seals, and can cause fire or explosion. Always use a capacitive spot welder with pure nickel strips for electrical connections.
8 What does “Free Shipping” include? When will I receive my order?
This 4-pack qualifies for free standard shipping with tracking. Orders are processed within 1–3 business days. Delivery typically takes 5–10 business days depending on your location. Expedited options may be available at checkout for an additional fee.
9. Can these batteries be taken on an airplane?
According to IATA regulations, lithium-ion batteries under 100Wh may generally be carried in carry-on baggage when properly protected against short circuits. Each Samsung 35E is approximately 12.6Wh (4 cells = 50.4Wh). However, airline policies vary; please verify with your carrier before flying. Always insulate terminals individually.
10. Will these fit my device with a flat top?
They fit most 18650 devices, but some hosts with physical reverse-polarity protection (a raised ring at the positive contact) may not make contact with a flat top. Check your device’s manual or inspect the positive terminal shape. A small magnet spacer can sometimes bridge the gap, but proceed carefully.
A: Choose Flat Top if you are spot welding battery packs, using devices with a flat spring contact, or building power banks. Choose Button Top if your device has a recessed positive terminal or a reverse-polarity protection ring (common in high-end flashlights ).
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
I used a LiitoKala charger to discharge these at 0.5A (based on the photo I took, very similar to my setup). Got 3399mAh, 3390mAh, 3345mAh, and 3355mAh. That's 96-97% of the 3500mAh rating. Very impressed with these genuine cells.
I bought these specifically for a 4S DIY power bank project. The flat top makes spot welding with nickel strips incredibly easy and secure. Using a quality tester shows consistent results across all 4 cells. Highly recommend for any pack builder.
These Samsung INR18650-35E cells power my outdoor remote sensor boxes perfectly! I built my custom IoT control units as shown, the high-capacity 35E lasts for months on a single charge without frequent replacements. Great consistent voltage, no swelling after long-term outdoor exposure. Worth every penny!
Using these cells in a custom built robot. The flat top fits perfectly in my spot welding jig. Very low IR readings on my multimeter. Will buy again.
I measured the internal resistance using my test equipment as pictured. They were all around 20-22m¦¸. The consistency across the 4-pack is impressive. Great for high quality portable projects.
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.