21700 LiFePO4 3000mAh 3.2V 3C Cell – High Discharge Rate Lithium Iron Phosphate for Solar, DIY 12V/24V Packs
Description
📝 Description
⚡ 21700 LiFePO4 3000mAh 3.2V 3C – The High‑Discharge Cell That Takes Your Solar & 12V/24V Projects to the Next Level!
When your solar storage or DIY battery pack demands real current on demand, the 21700 3.2V 3000mAh 3C LiFePO4 cell steps up. This isn’t a slow‑and‑steady energy cell; it’s a high‑discharge workhorse that pours out a continuous 9 amps (3C) and bursts up to 15 amps (5C) — enough to start a 12V water pump, ride out an inverter surge, or keep a 24V LED floodlight blazing without a flicker of voltage sag. And it does all this while delivering the absolute safety and brutal longevity that only lithium iron phosphate can offer.
🔋 Each cell packs a genuine 3,000mAh (9.6Wh) at a rock‑steady 3.2V nominal. Stack four in series and you instantly have a 12.8V 3Ah (38.4Wh) compact battery — the perfect size for a small solar garden light array, a portable router UPS, or a lightweight camping power box. String eight together for a 25.6V 3Ah (76.8Wh) pack that drives 24V inverters, 3D printers, or industrial sensors. With the 3C discharge rating, you can pull 9A continuously from even a single 4S string — no need to parallel a dozen cells just to start your equipment.
🛡️ LiFePO4 is the only lithium chemistry that’s truly non‑explosive, non‑toxic, and immune to thermal runaway. Build your battery into a wooden cabinet, a plastic toolbox, or your vehicle’s storage bay — it will never catch fire, vent gas, or leak acid. And with ≥2,000 deep‑cycle lifespan (to 80% capacity), this cell will still be delivering dependable power years after you’ve replaced your inverter and charge controller. Daily cycling for five years? Easy. Weekend use for a decade? No sweat.
⚙️ Every cell is a grade‑A, factory‑fresh unit with voltage and internal resistance rigorously matched before shipping. The flat‑top positive terminal is spot‑weld ready, and the robust nickel‑plated steel can is laser‑sealed against moisture and vibration. The ultra‑low internal resistance — typically ≤28mΩ — minimizes heat and voltage drop even when you flog it at the full 9A rate, keeping your system efficient and your pack healthy.
🌍 From a 12V shed‑light battery that sips solar, to a 24V ham radio field pack, to a 48V powerwall built tier by tier — this 21700 3C cell is the flexible, high‑power building block you’ve been needing. Stop over‑sizing lead‑acid, stop nursing NiMH, and start building the safe, long‑life lithium system you’ve been planning.
⭐ Key Features
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⚡ 3C Continuous Discharge (9A) / 5C Pulse (15A) – True high‑rate lithium iron phosphate. Each cell delivers a full 9 amps continuous; bursts of 15 amps handle motor start‑up and inverter surges without voltage collapse.
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🔋 Genuine 3000mAh Capacity – Nominal 3.2V, 9.6Wh per cell. Build a 4S 12.8V 3Ah (38.4Wh) or 8S 25.6V 3Ah (76.8Wh) pack with just a handful of cells — perfect for compact solar and backup systems.
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🔄 2,000+ Ultra‑Deep Cycle Life – Retains ≥80% capacity after 2,000 full depth‑of‑discharge cycles. That’s over 5 years of daily cycling or a decade of part‑time use — dramatically outlasting lead‑acid and NiMH.
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🛡️ Inherent LiFePO₄ Safety – No fire, no explosion, no toxic fumes. The only lithium chemistry you can confidently install indoors, in your vehicle, or in children’s educational projects.
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📉 Ultra‑Low Internal Resistance ≤28mΩ – Minimised heat generation and voltage sag, even under full 3C load. More stored energy goes to your appliances, not wasted as heat.
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🏅 100% Grade A Cells – Each cell is factory‑matched for voltage and internal resistance, with zero cycles and laser‑etched model codes. No B‑stock, no used pulls — only consistent, reliable power.
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📏 Standard 21700 Format – 21.5mm diameter × 70mm height. Fits all 21700 battery holders, plastic spacers, and shrink‑wrap jigs. Offers ~25% more volume than an 18650 for better heat dissipation and capacity.
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🔩 Flat‑Top Terminal – DIY Ready – Clean positive terminal designed for spot‑welding nickel strips, soldering tabs, or pressing into spring‑loaded 21700 sleds. Build your pack your way.
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🌡️ All‑Climate Operation – Discharge from -20°C to 60°C, charge from 0°C to 55°C. Reliably powers your gear in freezing winters and blazing summers.
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🧩 Modular & Stackable – Combine in series for 12V, 24V, 48V systems; parallel for more capacity. The 3C rating gives you both current and flexibility.
📊 Parameters
| Parameter | 21700 LiFePO₄ 3000mAh 3C Cell Specification |
|---|---|
| Cell Type | 21700 Cylindrical LiFePO₄ |
| Chemistry | Lithium Iron Phosphate (LiFePO₄) |
| Nominal Voltage | 3.2V |
| Typical Capacity | 3,000mAh (0.2C discharge, 25°C) |
| Nominal Energy | 9.6 Wh |
| Max Continuous Discharge | 9A (3C) |
| Pulse Discharge | 15A (5C, ≤5s) |
| Standard Charge Current | 1.5A (0.5C) |
| Max Fast Charge Current | 3A (1C) |
| Cut‑off Charging Voltage | 3.65V ±0.05V |
| Discharge Cut‑off Voltage | 2.0V (2.5V recommended for max cycle life) |
| Internal Resistance (AC 1kHz) | ≤28mΩ (typical, matched within batch) |
| Cycle Life | ≥2,000 cycles (0.5C charge/discharge, 25°C, 80% DoD) |
| Operating Temp – Charge | 0°C ~ 55°C |
| Operating Temp – Discharge | -20°C ~ 60°C |
| Storage Temp / Humidity | -20°C ~ 35°C / ≤85% RH (store at 3.2‑3.3V) |
| Dimensions (Diameter × Height) | Approx. 21.5mm × 70mm |
| Weight per Cell | Approx. 60‑62g |
| Terminal Type | Flat top (positive) / nickel‑plated steel can (negative) |
| Certifications | CE, RoHS, UN38.3 |
🎯 Applications
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☀️ DIY 12V Solar Storage – A 4S pack gives you 12.8V 3Ah; add parallel strings to build a 12V 15Ah or 30Ah bank. Perfect for solar garden lights, security cameras, and small off‑grid cabins.
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⚡ 24V Backup & Inverter Systems – An 8S configuration provides 25.6V 3Ah, ideal for 24V inverters, 3D printers, ham radios, and server backup. High current delivery keeps your gear running smoothly.
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🚐 RV & Camper Auxiliary Power – Replace heavy lead‑acid with a lightweight 12.8V LFP pack for interior LEDs, water pumps, and 12V fridges. Safe to install inside without venting concerns.
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🛑 Home Office UPS – Keep your router, modem, and VoIP phone online during blackouts with a compact 12.8V battery box. The 3C discharge easily handles the startup surge of networking gear.
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🔧 Portable Power Stations & Solar Generators – Build a silent, fume‑free power box with USB‑C PD, 12V cigarette socket, and an inverter. The high discharge rate supports power tools and small appliances.
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📡 Off‑Grid Sensors & IoT – Pair a single cell or a small 4S pack with a solar panel for year‑round remote monitoring of weather stations, water levels, or wildlife cameras.
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🚲 E‑Bike Accessory & Lighting Packs – Construct a dedicated 8S 24V battery for powerful LED headlights, horns, and display systems. Safe enough to charge inside your apartment.
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🎓 STEM Education & Makerspaces – The safest high‑discharge cell for university labs and DIY enthusiasts. Experiment with BMS design, pack building, and renewable energy storage without fire risk.
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
Affordable, safe, and functional. These 21700 cells are perfect for DIY solar projects.
These budget cells are a great entry point to LiFePO4 chemistry. Performance meets expectations.
Ordered 20 cells. All performed similarly. Acceptable consistency for generic cells.
Proper charging and discharging. Cells remain in perfect condition. Chemistry is stable.
3000mAh with 3C discharge. Perfect for DIY 12V/24V packs. Tested capacity close to rated. Good value.
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.