Samsung INR21700-50E 5000mAh 10A 21700 Battery 6-Pack with Nitecore UMS4 & Ui1 Chargers – High-Capacity Power System for RV Living, Overland Expeditions & Off-Grid Communication Bases
Description
Why This Bundle
The Samsung 50E is a high-energy 21700 cell built for runtime, not extreme current — a genuine 5000mAh capacity in a moderate-drain package that's a common choice for e-bikes, power tools, and long-runtime battery packs. Six of these cells need a charging setup that can keep up — at home and on the go. This bundle pairs 6 genuine Samsung INR21700-50E batteries with the NITECORE UMS4 (a 4-bay smart LCD charger for fast, monitored charging at your desk) and the NITECORE UI1 (an ultra-compact single-slot charger for travel or topping off a spare cell). Together, all 6 batteries can be charged at once — 4 in the UMS4, and the 5th and 6th staggered through the UI1 — with full visibility into every cell's health.
Samsung INR21700-50E Specifications
| Item | Spec |
|---|---|
| Model | Samsung INR21700-50E (Flat Top) |
| Typical Capacity | 5000mAh |
| Minimum/Rated Capacity | 4900mAh (standard) / 4753mAh (rated, 1C discharge) |
| Nominal Voltage | 3.6V |
| Max Continuous Discharge | 9.8A |
| Standard Charge Current | 2.45A |
| Maximum Charge Current | 4.9A |
| Charge Cutoff Voltage | 4.20V |
| Discharge Cutoff Voltage | 2.5V |
| Chemistry | Li-ion, energy-focused |
| Cell Size | 21700 (approx. Φ20.25mm × 70.8mm, max weight 69g) |
| Terminal Type | Flat Top only |
| Protection Circuit | None (unprotected cell) |
| Typical Use | E-bikes, power tools, drones, energy storage systems, robotics, professional battery pack builds |
Note: Samsung's own product positioning specifies the 50E for ESS, power tools, drones, medical devices, robots, and EV applications — and explicitly notes it is not intended for e-cigarettes, flashlights, RC cars, or electric skateboards. It's an energy/runtime cell, not a high-drain one.
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 Chargers: NITECORE UMS4 + NITECORE UI1
NITECORE UMS4 — 4-Bay Smart LCD Charger
- USB-C input with QC support: up to 4,000mA total output, up to 3,000mA on a single bay with a QC adapter — the closest match here to the 50E's 2.45A standard charge current
- Independent 4-bay control: charge and monitor each battery separately
- Real-time LCD display: shows battery health (Good/Poor), internal resistance, charging current, voltage, charged capacity, and charging time
- 3 automatic charging modes: CC, CV, and -dV/dt, selected automatically based on battery type and charge level
- Manual adjustment: set charging voltage and current (300mA–3000mA) for specialized battery types
- Safety features: automatic internal resistance detection, reverse-polarity and short-circuit protection, overtime charging protection, and over-discharged battery activation/restoration
- Fire-retardant PC/ABS housing with built-in temperature regulation
NITECORE UI1 — Compact Single-Slot Charger
- Type-C input: automatically adapts to the optimal charging mode, works with power banks, solar panels, and USB adapters
- Up to 1000mA output with automatic CC/CV mode selection
- Trickle charging protects over-discharged cells and extends battery lifespan
- Over-discharge activation for protected Li-ion batteries
- Ultra-lightweight: just 40.5g — ideal for travel, a backup charge, or topping off the 6th cell while the UMS4 handles the other 4
Supported Battery Types & Voltage
NITECORE UMS4 — compatible with 3.6V/3.7V Li-ion, 3.8V Li-ion, 3.2V LiFePO4, and 1.2V Ni-MH/Ni-Cd batteries, including the Samsung 50E (21700) in this bundle: IMR/Li-ion/LiFePO4: 10440, 14500, 14650, 16500, 16340(RCR123), 16650, 17350, 17500, 17650, 17670, 17700, 18350, 18490, 18500, 18650, 18700, 20700, 21700, 22500, 22650, 25500, 26500, 26650, 26700 Ni-MH/Ni-Cd: AA, AAA, AAAA, C, D Output: up to 3,000mA per bay (QC mode) / 4,000mA total
NITECORE UI1 — compatible with 3.6V/3.7V Li-ion/IMR batteries, including the Samsung 50E (21700): 10340, 10350, 10440, 10500, 12340, 12500, 12650, 13450, 13500, 13650, 14430, 14500, 14650, 16500, 16340(RCR123), 16650, 17350, 17500, 17650, 17670, 18350, 18490, 18500, 18650, 20700, 21700, 22500, 22650, 25500, 26500, 26650 Output voltage: 4.2V±1% · Output current: up to 1000mA
Compatibility Notes
The UMS4's bays and spring-loaded contacts are sized to accommodate 21700 cells like the 50E without any adapter, and the UI1's slot fits the same length range. Since the 50E has a relatively large 5000mAh capacity, charging speed does matter here: the UMS4 (up to 3,000mA on a single occupied bay) will get closer to the 50E's 2.45A rated charge current than the UI1 (up to 1,000mA), so we'd suggest running your most time-sensitive cells through the UMS4 and using the UI1 for the batteries you're least in a hurry about.
What's Included
- Samsung INR21700-50E Battery × 6
- NITECORE UMS4 4-Bay Charger × 1
- NITECORE UI1 Single-Slot Charger × 1
- USB-C Charging Cables × 2
- User Manuals × 2
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 genuine, compatible chargers such as the NITECORE UMS4 and UI1
- The 50E is an unprotected cell intended for compatible, purpose-built devices such as e-bikes, power tools, and engineered battery packs — it is not intended for e-cigarettes, flashlights, RC cars, or electric skateboards
- Never discharge below 2.5V or charge above 4.2V
FAQ
Q: Can I charge all 6 batteries at the same time? A: Yes. The UMS4 charges 4 batteries independently and simultaneously, while the UI1 can charge a 5th battery alongside it — or you can stagger the 5th and 6th through the UI1 if only one is used at a time.
Q: Is the Samsung 50E suitable for flashlights? A: No. Samsung's own product positioning explicitly states this cell is not intended for flashlights, RC cars, or electric skateboards. It's built for e-bikes, power tools, drones, energy storage, and similar runtime-focused applications.
Q: Will 21700 batteries fit in both chargers? A: Yes. Both the UMS4 and UI1 are sized to accommodate 21700 cells like the 50E without any adapter.
Q: What's the difference between the UMS4 and UI1 in this bundle? A: The UMS4 is a 4-bay charger with an LCD screen showing detailed real-time data (battery health, internal resistance, voltage, capacity) and faster QC charging up to 3,000mA on a single bay. The UI1 is a single-slot, ultra-compact charger (40.5g) best suited for travel or a slower backup charge — with a 5000mAh cell like the 50E, it will take noticeably longer to fill on the UI1 than on the UMS4.
Q: How do I check if a battery is degraded? A: The UMS4's LCD display shows battery health as "Good" or "Poor" along with internal resistance readings, making it easy to spot cells that have aged or lost performance.
Q: What's in the box? A: 6 Samsung INR21700-50E batteries, 1 NITECORE UMS4 charger, 1 NITECORE UI1 charger, 2 USB-C charging cables, and user manuals for both chargers.
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
I have about 60 cycles on these 50E cells. They all still test at over 4900mAh. The UMS4 helps me monitor each cell's health for critical trips.
The kit arrived in a well-organized box with protective cases for all cells and both chargers. A truly complete off-grid power solution.
Before every major trip, I check the internal resistance of all cells. The UMS4's testing gives me confidence in my off-grid power.
All six cells measured within 10mAh of each other. The UMS4 grading confirmed three perfectly matched pairs for reliable expedition power.
I also use the UMS4 for my AA GPS batteries. The multi-chemistry support is essential for complete expedition power management.
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.