Molicel P42A 4200mAh 21700 Flat Top 2-Pack | 45A Continuous – No Sag, No Excuses
Description
45 Amps. Continuous. Period.
Stop scrolling. You've found the cell that doesn't lie about its ratings. The Molicel INR-21700-P42A delivers a genuine 45A continuous discharge — not a "pulse" number masquerading as continuous, not a lab-only peak. Forty. Five. Amps. Paired with a 4200mAh capacity, it’s the highest-performance 21700 you can buy without stepping into exotic territory. Two cells in this pack. That's 90A of combined current capability and 31 watt-hours of energy. Build. Swap. Dominate.
Numbers Don't Lie
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≤14mΩ internal resistance. At 45A, voltage drop is just 0.63V. Your gear never starves.
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15.5Wh per cell. Enough juice to run a 3000-lumen turbo light for solid bursts, not seconds.
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500+ cycles to 70% capacity. Treat it rough — it’ll still wake up ready.
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70.0mm × 21.4mm. Standard 21700 flat top. Drops into anything designed for unprotected 21700s.
Unprotected Flat Top — As It Should Be
No PCB. No button. No extra length. No resistance you didn't ask for. The P42A is a bare cell, built for hobbyists and pros who know how to handle lithium-ion safely. Use a 4.2V charger. Use devices with low-voltage cutoff. That's it. The cell's own PTC, vent, and CID handle the rest.
Born for This
Flashlight turbo junkies: your FET-driven SBT90.2, quad W2, or multi-emitter hot-rod finally has a cell that feeds it without voltage collapse. RC racers and drone pilots: build a 4S pack and feel the instant punch. Power tool rebuilders: replace those saggy old cells and bring your 18V drill back to life. This isn't a "general purpose" battery — it's a precision instrument for people who push their gear to the edge.
Two Cells. Infinite Possibilities.
Keep a spare in your pocket. Build a 2S pack for a portable monster. Weld them into a tool battery. The 2-pack gives you flexibility without the bulk of a case lot.
Key Features
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45A Continuous / 50A+ Pulse – True, verified, no marketing fluff.
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4200mAh Real Capacity – 15.5Wh per cell. Runtime that respects the amps.
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Standard 21700 Flat Top – 70.0mm × 21.4mm. No button, no PCB.
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≤14mΩ Ultra-Low IR – Minimal sag, maximum power delivery.
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500+ Cycles – 70% capacity retention after hundreds of charges.
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Passive Safety – PTC, vent, CID. Built-in protection you can trust.
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2-Pack – Build, swap, or backup.
Technical Parameters
| Parameter | Specification |
|---|---|
| Model | Molicel INR-21700-P42A |
| Form Factor | 21700 Unprotected Flat Top |
| Nominal Capacity | 4200mAh (15.5Wh) |
| Nominal Voltage | 3.7V |
| Full Charge Voltage | 4.2V |
| Discharge Cut-off | 2.5V |
| Max Continuous Discharge | 45A |
| Max Pulse Discharge | >50A |
| Internal Resistance | ≤14mΩ (AC 1kHz) |
| Cycle Life | ≥500 (to 70%) |
| Dimensions | ~21.4mm Ø × 70.0mm |
| Weight | ~68g |
| Chemistry | INR (NMC) |
Applications
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Turbo Flashlights – FET monsters, multi-emitter builds, SBT90.2 hot-rods.
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FPV Drones & RC – 4S/6S racing packs, 1/8 scale truggies, speed runs.
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Power Tool Rebuilds – 18V/20V drills, impacts, circular saws.
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DIY High-Current Projects – Power banks, inverters, portable workstations.
FAQ
Q: 45A continuous — really?
A: Yes. Molicel rates it for 45A continuous, and independent testing backs it up. It's the benchmark for high-drain 21700s.
Q: Unprotected? Isn't that risky?
A: Only if you misuse it. Pair it with a quality 4.2V charger and devices with built-in low-voltage cutoff (all modern high-performance gear has this). The cell's PTC, vent, and CID add passive safety.
Q: Flat top only?
A: Yes. Flat top is the universal standard for high-drain applications — tighter fit, lower resistance, better for welding.
Q: Can I use this in an 18650 device?
A: No. 21700 is larger. Your device must explicitly support 21700.
Q: How do I store the spare?
A: 3.6–3.7V (~50% charge) in a plastic case. Check every 3 months.
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
Didn't think 45A 21700s were real until I tested these Molicel. They outperform every other 21700 in my collection.
Used in an airsoft AEG with a high-torque motor. Semi-auto snappy, full auto no cycle drop. 45A pulse so no bottleneck.
Ordered many times, every Molicel P42A arrives perfectly balanced. They handle 45A daily in my tool pack.
The 4000mAh 32A cells are excellent in my tool bag. Screwdriver peaks at 30A, these deliver without stalling. Battery life improvement over 3000mAh.
P42A is the gold standard for 21700 high drain. My SBT90.2 blaster reaches max lumens and stays there.
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.