Molicel INR21700-P42A 4200mAh 45A 21700 Battery 2-Pack with XTAR MC2 Dual-Slot Charger – Extreme High-Power Kit for Professional Tactical Lights & High-Performance Drones
Description
Why This Bundle
The Molicel P42A is one of the strongest 21700 cells available — a 4200mAh typical capacity paired with a genuine 45A continuous discharge rating and a very low AC impedance (<15mΩ), making it a favorite for high-drain battery pack builds that need serious current without sacrificing runtime. This bundle pairs 2 genuine Molicel INR21700-P42A batteries with the XTAR MC2 — a compact, USB-C powered dual-slot charger that intelligently adjusts charging current and includes 0V activation for over-discharged cells. Everything you need to charge and maintain your cells, ready out of the box.
Molicel INR21700-P42A Specifications
| Item | Spec |
|---|---|
| Model | Molicel INR21700-P42A (Flat Top) |
| Typical Capacity | 4200mAh |
| Minimum Capacity | 4000mAh |
| Nominal Voltage | 3.6V |
| Max Continuous Discharge | 45A |
| Standard Charge Current | 4.2A |
| Maximum Charge Current | 8.4A |
| Charge Cutoff Voltage | 4.20±0.05V |
| Discharge Cutoff Voltage | 2.5V |
| AC Impedance (1kHz) | <15mΩ |
| Cycle Life | ~500 cycles at 4.2A charge/10A discharge to 80% capacity |
| Chemistry | Li-ion, ultra-high-power |
| Cell Size | 21700 (approx. Φ21.2–21.7mm × 70–70.2mm, approx. weight 66.5g) |
| Terminal Type | Flat Top only |
| Protection Circuit | None (unprotected cell) |
| Typical Use | Power tools, EVs/PHEVs, high-drain battery pack builds — Molicel specifies this as a pack-only cell for use with proper battery management |
Important: Molicel positions the P42A as a pack-only, high-power cell intended for use within a properly engineered battery management system (BMS) — not as a standalone consumer replacement cell for casual devices.
This is an unprotected cell — avoid mixing with batteries of a different brand, model, or charge state, and inspect the wrap for damage before every use to prevent short circuits.
The Charger: XTAR MC2
- USB-C input: DC 5V/1A, works with USB wall adapters, power banks, laptops, and car chargers
- Dual independent charging slots: charge two batteries simultaneously with individual monitoring
- Intelligent current adjustment: automatically sets charging current to 0.5A×2 (with a 5V/1A source) or 0.25A×2 (with a lower-power source)
- 0V Activation: helps recover batteries that have over-discharged
- Multiple safety protections: reverse-polarity protection, short-circuit protection, temperature monitoring
- Compatible with protected 20700/21700 cells (current USB-C generation)
- Ultra-compact & lightweight: just 24g, 92mm × 40mm × 32mm
XTAR MC2 – Supported Battery Types & Voltage
Compatible with 3.6V/3.7V Li-ion batteries, including the Molicel P42A (21700) in this bundle, across a length range of approximately 31mm to 71.4mm — covering everything from 10440 up through 21700 and 26650 cells.
End-of-charge voltage: 4.20±0.05V · End-of-charge current: ≤120mA
Compatibility Notes
The MC2's charging slots accommodate battery lengths up to roughly 71.4mm, which comfortably fits the P42A's ~70–70.2mm length, including its Flat Top terminal.
Important: The P42A supports a standard charge current of 4.2A (up to 8.4A max), but the MC2 charges at a maximum of 0.5A per slot — a very large gap. Charging a 4200mAh high-power cell at 0.5A will take considerably longer than its rated charge time (1.5 hours at standard current) suggests, likely stretching to several hours. The MC2 is best suited here as a portable, gentle-charging backup rather than your primary charger for these cells.
What's Included
- Molicel INR21700-P42A Battery × 2
- XTAR MC2 Charger × 1
- USB Cable × 1
- User Manual × 1
Safety Tips
- Store batteries in a proper case, keeping them away from loose metal objects to prevent short circuits
- Never disassemble, puncture, burn, or submerge the batteries
- Charge only with a genuine, compatible charger such as the XTAR MC2
- The P42A is an unprotected, ultra-high-power cell intended for use within a properly engineered battery pack with its own BMS — do not use it as a standalone replacement cell in casual consumer devices
- Never discharge below 2.5V or charge above 4.2V
FAQ
Q: Can the XTAR MC2 charge Molicel P42A batteries safely? A: Yes, the MC2 correctly detects and charges 3.6V/3.7V Li-ion cells including 21700s like the P42A, with proper 4.2V cutoff voltage. Just be aware the charging current is dramatically lower than this cell's 4.2A standard charge rate, so a full charge will take considerably longer than it would on a high-current charger.
Q: Is the P42A meant for use in standalone devices like flashlights? A: Molicel positions the P42A as a pack-only cell intended for use within a properly designed battery management system, not as a standalone drop-in cell for casual consumer devices. It's built for power tools, EVs/PHEVs, and engineered high-drain battery packs.
Q: Will a 21700 battery actually fit in the MC2? A: Yes. The MC2's slots accommodate batteries up to roughly 71.4mm in length, which covers the P42A's length comfortably.
Q: How long will it take to fully charge a P42A on the MC2? A: Since the MC2 charges at up to 0.5A per slot while the P42A is rated for 4.2A standard charging (1.5-hour charge time at that rate), expect a full charge on the MC2 to take considerably longer — likely several hours. This charger is better suited as a portable or backup option for these cells rather than a primary fast charger.
Q: Can I charge both batteries at the same time? A: Yes. The MC2 has 2 independent slots and can charge both simultaneously, automatically adjusting current based on your power source.
Q: What's in the box? A: 2 Molicel INR21700-P42A batteries, 1 XTAR MC2 charger, a USB cable, and a user manual.
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.