DMEGC 50E 21700 Battery 2 Pack - 5000mAh 15A High Capacity Medium Drain (21700-50E)
Description
Power your devices with reliable, long-lasting energy using the DMEGC 50E 21700 Battery 2 Pack (Model: 21700-50E). Engineered by DMEGC (Dongyang Magnetic Materials), a leading Chinese manufacturer of lithium-ion cells, this 21700 battery delivers an impressive 5000mAh capacity paired with a stable 15A continuous discharge (30A pulse). It strikes the perfect balance between high capacity and moderate power output, making it an excellent choice for applications that require both long runtime and decent current delivery—without the premium price tag of top-tier brands. Whether you are upgrading your e-bike battery pack, powering a high-lumen flashlight, or building a custom DIY power station, the DMEGC 50E offers reliable, safe, and cost-effective performance. This listing includes two individual cells (not pre-assembled), giving you the flexibility to configure them in series or parallel for your specific project needs.
Key Features
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High Capacity (5000mAh): Provides 5000mAh of reliable capacity, significantly extending your device's runtime between charges.
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Moderate 15A Continuous Discharge: Delivers stable 15A continuous current, suitable for medium-drain devices like flashlights, e-bikes, and power tools. Supports up to 30A pulse discharge for short bursts of higher power.
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Balanced Performance: Offers a perfect middle ground between high-capacity low-drain cells (e.g., Samsung 50E at 9.8A) and high-drain lower-capacity cells (e.g., Samsung 40T at 35A).
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Cost-Effective Alternative: DMEGC cells provide excellent performance at a more accessible price point, making them a great choice for budget-conscious DIY enthusiasts.
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Flat Top Design: Standard flat top configuration, compatible with most battery holders, spring-loaded contacts, and DIY battery pack builds.
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2-Pack Value: Supplied as two individual cells, allowing you to build a 2S series pack (7.2V), a 1S2P parallel pack (10000mAh), or replace worn-out cells in pairs.
Technical Parameters
| Parameter | Value |
|---|---|
| Brand & Model | DMEGC 21700-50E |
| Battery Type | Lithium-Ion (Li-Ion) |
| Size | 21700 (Diameter 21mm, Height 70mm) |
| Capacity | 5000mAh (Minimum 4900mAh) |
| Nominal Voltage | 3.6V |
| Full Charge Voltage | 4.2V |
| Cut-off Voltage | 2.5V |
| Continuous Discharge Current | 15A |
| Pulse Discharge Current | Up to 30A (not for continuous use) |
| Positive Terminal | Flat Top |
| Protection Circuit | No (Unprotected Flat Top Cell) |
| Operating Temperature | -20°C to 60°C |
| Quantity in Package | 2 Pcs (2 Pack) |
Applications
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High-Power Flashlights & Headlamps: Powering high-lumen tactical flashlights, searchlights, and headlamps that require sustained brightness and reliable runtime.
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Electric Bikes (E-Bikes) / E-Scooters / E-Skateboards: Building or upgrading battery packs for light to medium-duty electric rides. Two cells can serve as a starter pack or replacement for worn-out cells.
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Power Tools: Upgrading cordless drills, impact drivers, and other handheld power tools for longer work sessions without the high cost of premium cells.
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DIY Battery Packs: Creating custom 1S2P, 2S1P, or 2S2P battery banks for robotics, drones, or portable power stations.
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Outdoor & Camping Gear: Powering portable fans, heated jackets, camping lights, and other outdoor electronics.
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Portable Power Stations: Building compact yet powerful battery banks for camping, emergency power, or off-grid applications.
FAQ
Q1: Does '2 Pack' mean it's a 2S battery pack assembled together?
A: No. "2 Pack" means you will receive two separate individual cells. You will need to assemble them in series (for 7.2V), parallel (for 10000mAh), or a specific configuration based on your device's requirements.
Q2: How does DMEGC 50E compare to Samsung 50E?
A: The DMEGC 50E offers the same 5000mAh capacity but provides a higher 15A continuous discharge compared to the Samsung 50E's 9.8A. This makes the DMEGC 50E more versatile, capable of handling medium-drain applications (e-bikes, power tools) that the Samsung 50E might struggle with. DMEGC is also generally more affordable.
| Brand | Model | Capacity | Continuous Discharge | Best For |
|---|---|---|---|---|
| DMEGC | 50E | 5000mAh | 15A | Balanced (medium-drain) |
| Samsung | 50E | 5000mAh | 9.8A | Long runtime (low-drain) |
| Samsung | 50S | 5000mAh | 25A | High power (high-drain) |
| Samsung | 40T | 4000mAh | 35A | Maximum power (extreme-drain) |
Q3: Can I use these two cells to build a battery pack for my E-Bike?
A: A single 3.6V cell (or two cells) is not enough for an e-bike (which typically requires 36V, 48V, or 52V). Two cells can be combined in series to create a 7.2V pack, suitable for small devices like some flashlights or RC models. For an e-bike, you need many more cells wired in series. The DMEGC 50E is a great choice for light to medium e-bike packs due to its 15A discharge. Always consult a professional if you are unsure about building a pack.
Q4: Does this battery have a protection circuit (PCB/BMS) built-in?
A: No. The DMEGC 50E is an unprotected flat-top cell. It relies on the external device or a BMS (Battery Management System) to handle overcharge, over-discharge, and short-circuit protection.
Q5: What charger should I use?
A: Use a dedicated intelligent Li-Ion charger designed for 3.6V/4.2V cells. Ensure the charger supports the correct voltage for your specific pack setup (e.g., 1S charger for single cells, 2S charger for 2 cells in series, etc.).
Q6: How do I identify positive and negative terminals?
A: The flat top (the side with the DMEGC logo and model number) is the Positive (+) terminal. The bottom (the side with the shiny metal casing and a slight indentation) is the Negative (-) terminal.
Q7: Is DMEGC a reliable brand?
A: Yes. DMEGC (Dongyang Magnetic Materials) is a well-established Chinese manufacturer with significant experience in lithium-ion cell production. While not as globally recognized as Samsung or LG, their cells offer solid performance, good safety standards, and excellent value for money.
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
Using in my telescope dew heater, stable output. 15A more than enough.
On high speed, draws 12A, these last hours. Two pack keeps the breeze.
DMEGC improved their wrap quality. Cells are well protected. 15A is accurate.
I added a button top adapter, works fine. 2 pack is good for my convoy lights.
15A vs 10A, same capacity. DMEGC wins for my power tool flashlight combo.
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.