4-Pack BAK INR2170-45D 21700 4500mAh 45A High Drain Flat Top Battery – For Vaping, Power Tools, Flashlights & RC
Description
Description
Experience massive power and capacity with the BAK INR2170-45D, a premium 21700 high-drain cell engineered for extreme applications. This 4-pack delivers an enormous 4500mAh capacity and a true 45A continuous discharge, making it the ideal upgrade for high-wattage vaping, heavy-duty power tools, ultra-bright 21700 flashlights, and high-performance RC models. The flat top design ensures broad compatibility with spring-loaded contacts and simplifies spot-welding for custom battery packs. With ultra-low internal resistance and robust cycle life, the 45D provides sustained, reliable power when your device demands maximum output.
Key Features
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Genuine BAK INR2170-45D Cell – Manufactured by BAK, a leading lithium-ion producer, ensuring consistent quality, safety, and high-rate performance.
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4500mAh Ultra-High Capacity – Significantly extends runtime compared to typical 18650 or 3000mAh 21700 cells; perfect for power-hungry devices that need long-lasting energy.
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45A Continuous Discharge (60A Pulse) – True 45A continuous rating handles extreme loads with ease; pulse capability up to 60A for short bursts. Ideal for power tools, sub-ohm vaping, and direct-drive flashlights.
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Ultra-Low Internal Resistance (≤12mΩ) – Minimizes voltage sag and heat generation under load, delivering immediate throttle response and maintaining peak brightness.
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Flat Top Design – Compatible with all standard 21700 spring-contact devices, chargers, and battery trays. Flat positive terminal ensures reliable spot-welding for DIY pack construction.
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Excellent Energy Density – 21700 format provides a perfect balance of size, capacity, and power output, outperforming most 18650 cells in both runtime and current delivery.
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4-Pack Value – Ideal quantity for dual-battery mods, rebuilding tool packs, or building high-current RC packs. Protective packaging ensures safe delivery.
Parameters
| Parameter | Specification |
|---|---|
| Model | BAK INR2170-45D (N21700-45D) |
| Typical Capacity | 4500 mAh (0.2C discharge to 2.5V) |
| Minimum Capacity | 4400 mAh |
| Nominal Voltage | 3.6 V (typical operating 3.7 V) |
| Max Continuous Discharge | 45 A (cell temperature ≤ 80°C) |
| Max Pulse Discharge | 60 A (short burst, monitor temperature; not for continuous use) |
| Discharge Cut-off Voltage | 2.5 V (never over-discharge) |
| Standard Charge | CC-CV, 0.5C (2250 mA) to 4.2 V, cut-off 50 mA |
| Max Charge Current | 1C (4500 mA); 2C fast charge possible with strict temperature control |
| Internal Resistance (AC) | ≤ 12 mΩ (AC 1 kHz) |
| Internal Resistance (DC) | Approx. 16–20 mΩ |
| Cycle Life | ≥ 300 cycles (to 80% capacity, 1C charge / 10A discharge) |
| Operating Temperature (Discharge) | -20°C to 60°C (ensure proper cooling for sustained high current) |
| Storage Voltage / Temperature | 3.6–3.7 V (40–50% charge), -20°C to 25°C recommended |
| Top Type | Flat Top |
| Dimensions | Approx. 21.2 mm diameter × 70.3 mm length |
| Weight (single cell) | Approx. 69 g |
| Package Includes | 4 × BAK INR2170-45D 21700 cells in protective packaging |
Applications
Recommended For
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High-power vaping: regulated and mechanical mods, sub-ohm tanks with builds safely within 45A continuous limit.
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Cordless power tools: impact drivers, drills, circular saws, and high-torque wrenches when used in properly engineered battery packs with BMS.
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High-output 21700 flashlights: FET-driven or multi-emitter lights requiring sustained current up to 45A for maximum brightness.
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RC models: cars, trucks, boats, and quadcopters that demand high burst current and extended runtimes.
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E-bike and e-scooter battery packs: per-cell discharge within 45A; the high capacity reduces the number of parallel cells needed.
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Portable high-power energy storage: DIY power banks and field power supplies capable of charging laptops and high-wattage devices.
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Garden tools and portable spot welders: any high-drain application where both power and capacity are critical.
Not Recommended For
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Low-power, ultra-long-runtime devices (solar lights, sensors, clocks): the high-rate capability is wasted; choose a 5000mAh low-drain 21700 cell for maximum runtime.
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18650-only devices: the 21700 format is physically larger (21mm x 70mm) and will not fit. Verify your device’s battery compartment size before purchase.
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Standard USB power banks that do not require high current: the 45A performance is unnecessary, and a lower-cost high-capacity cell would be more economical.
FAQ
Q: Is this battery truly rated for 60A?
A: The BAK INR2170-45D has a continuous discharge rating of 45A. The 60A figure refers to a short pulse capability only. For continuous use, you must design your application to stay at or below 45A to ensure safe operation and long cell life. Operating continuously at 60A will cause overheating, severe capacity degradation, and potential safety risks.
Q: Can I use this battery in my 18650 device?
A: No. This is a 21700 cell, which is approximately 21mm in diameter and 70mm in length. It is physically larger than an 18650 (18mm x 65mm) and will not fit unless your device is specifically designed for 21700. Always check your device’s specifications before ordering.
Q: What is the advantage of 21700 over 18650?
A: The 21700 format offers a significant increase in energy capacity and power output without an extreme increase in size. The 45D delivers 4500mAh and 45A, whereas the best 18650 cells typically max out around 3500mAh at 10A, or 3000mAh at 35-40A. This means longer runtime and higher current capability in a single cell.
Q: Does this cell have built-in protection?
A: No, the BAK INR2170-45D is an unprotected flat top cell. This allows unrestricted current flow for high-drain applications. When building multi-cell series or parallel packs, you must use an external BMS (Battery Management System) rated for at least 60A to protect against overcharge, over-discharge, and balancing issues. For single-cell use, ensure your device has its own protection mechanisms.
Q: Can I solder directly onto the battery?
A: Never solder directly onto lithium-ion cell terminals. The heat can damage internal separators and safety vents, leading to permanent damage or dangerous failure. Always use a spot welder to attach nickel strips. For applications requiring wires, spot-weld nickel tabs with pre-soldered leads, or purchase pre-wired cells.
Q: How should I store these batteries when not in use?
A: Store in a cool, dry place at a nominal voltage of 3.6–3.7V (approximately 40-50% state of charge). Avoid storing fully charged or fully discharged for extended periods, as this accelerates aging. Use a non-conductive battery case to prevent accidental short circuits.
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.