4-Pack Molicel P28A 2800mAh 35A High-Drain 18650 Flat Top Battery – Unprotected Cell for Power Tools, RC & Flashlights
Description
Key Features
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35A True Continuous Discharge – Delivers massive, stable power for high-drain devices. Handles sub-ohm mods, power tool start-up surges, and RC motor bursts without voltage sag.
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Ultra-Low Internal Resistance (≤18mΩ) – Minimizes heat generation and energy loss, ensuring maximum power reaches your device even under extreme loads.
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2800mAh Balanced Capacity – Optimized for high-drain use; enough runtime for demanding tools and mods without sacrificing peak current capability.
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Flat Top Design – Compatible with all standard 18650 spring-contact devices, flashlights, and chargers. Ideal for DIY pack builders spot-welding nickel strips.
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Unprotected Cell – No built-in protection circuit, allowing unrestricted current flow for high-power applications. Always use an external BMS when building multi-cell packs.
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4-Pack Convenience – Perfect quantity for dual-battery mods, replacing power tool cells, or building small RC packs. Genuine Molicel quality in every cell.
Technical Parameters
| Parameter | Specification |
|---|---|
| Model | Molicel INR-18650-P28A |
| Typical Capacity | 2800 mAh (0.2C discharge to 2.5V) |
| Minimum Capacity | 2700 mAh |
| Nominal Voltage | 3.6 V (typical operating 3.7 V) |
| Max Continuous Discharge | 35 A (cell temperature ≤ 75°C) |
| Max Pulse Discharge | Up to 50 A+ (short burst, monitor temperature) |
| Discharge Cut-off Voltage | 2.5 V (do not over-discharge) |
| Standard Charge | CC-CV, 0.5C (1400 mA) to 4.2 V, cut-off 50 mA |
| Max Charge Current | 1C (2800 mA); 2C fast charge possible with strict temperature control |
| Internal Resistance | ≤ 18 mΩ (typically 12–14 mΩ, AC 1 kHz) |
| Cycle Life | ≥ 300 cycles (to 70% capacity, 1C charge / 10A discharge) |
| Operating Temperature (Discharge) | -20°C to 60°C (ensure adequate cooling at high currents) |
| Top Type | Flat Top, Unprotected |
| Dimensions | Approx. 18.5 mm diameter × 65.2 mm length |
| Weight (single cell) | Approx. 48 g |
| Package Includes | 4 × Molicel P28A 18650 Flat Top cells in protective packaging |
Applications
Recommended For (High-Drain Devices)
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Cordless Power Tools: Drills, impact drivers, wrenches, and circular saws for battery pack rebuilds.
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RC Models: Cars, trucks, boats, and quadcopters requiring instant high current bursts.
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Airsoft AEGs: High rate-of-fire electric guns.
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High-Output Flashlights: Direct-drive FET or multi-emitter hot-rod lights demanding 30A+.
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DIY Battery Packs: Spot welders, portable power stations, and custom high-current projects.
Not Recommended For
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Long-runtime low-drain devices (solar lights, sensors, clocks) – choose 3500mAh high-capacity cells.
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Standard USB power banks (5V/2A) – 35A capability is wasted; choose higher capacity cells.
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Devices requiring button top cells (use a magnetic spacer if necessary).
FAQ
Q: What does "Unprotected" mean and is it safe?
A: Unprotected means the cell does not have a built-in protection circuit board. This allows maximum current flow without restriction, which is essential for high-drain applications. You must rely on your device's protection features (for single-cell use) or install an external BMS (for multi-cell packs). Never short-circuit or over-discharge unprotected cells.
Q: Is 2800mAh enough? I see 3000mAh and 3500mAh cells.
A: 2800mAh is the ideal capacity for high-drain cells. The P28A trades a small amount of capacity (compared to 3000mAh) for extremely low internal resistance and a true 35A rating. For high-power devices, consistent voltage under load is far more important than a few hundred extra mAh. For low-drain, long-runtime devices, choose a 3500mAh cell instead.
Q: Can I rebuild my drill's battery pack with these?
A: Absolutely. The P28A is excellent for rebuilding power tool packs. Ensure all cells are matched (voltage and internal resistance). Spot-weld nickel strips — never solder directly to the cell — and install a BMS rated for at least 40A.
Q: How should I charge and store these cells?
A: Use a quality Li-ion charger with CC-CV algorithm. Charge at 0.5C (1.4A) for best longevity. Store in a non-conductive case at 3.6-3.7V (about 40% charge) in a cool, dry place. Never store fully charged or fully discharged for extended periods.
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.