TMR 18650 18.5V 6000mAh 1C Pre-Welded Li-ion Battery Pack – 3 Parallel 5 Series (3P5S) Layout with Nickel Tabs for Extended-Run 18V Power Tools & Flashlights
Description
Product Description:
This TMR 18650 18.5V 6000mAh 1C Li-ion Battery Pack is a premium, ultra-high-capacity power solution designed for professionals and serious DIY enthusiasts who demand maximum runtime. Engineered in a 3 Parallel × 5 Series (3P5S) layout, it delivers a stable 18.5V output with a massive 6000mAh capacity, offering 50% more runtime compared to standard 4000mAh 18V packs.
Constructed using genuine high-quality 18650 cells, this battery pack comes with nickel tabs already spot-welded in place, allowing for quick and hassle-free integration into your projects. The multi-layer safety design and advanced spot welding ensure maximum durability, stability, and user safety. With a reliable 1C discharge rate, this ultra-capacity pack provides extended, dependable performance for your most demanding devices.
Key Features:
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Ultra-High-Capacity 3P5S Layout (18.5V 6000mAh): Features a 3 Parallel × 5 Series configuration, delivering a powerful 18.5V output and a massive 6000mAh capacity for extended runtimes (50% more than standard 4000mAh packs).
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Pre-Welded Nickel Tabs: Comes with nickel strips already spot-welded for easy connection. No need for complicated soldering or battery spot welding.
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Premium 18650 Cells: Built with high-quality, true-to-spec 18650 cells with a stable 1C discharge rate, ensuring reliable power delivery.
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Advanced Spot Welding Technology: Professional spot welding ensures tight, secure connections between cells, reducing internal resistance and enhancing long-term stability.
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Multi-Layer Safety Protection: Designed with rigorous safety standards to prevent leakage, short circuits, and overheating, ensuring safe operation.
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6000mAh Ultra Capacity for Extended Runtimes: Provides 50% more energy than standard 4000mAh packs, allowing your devices to run much longer between charges.
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Ready-to-Use Convenience: Pre-assembled and pre-welded, eliminating the hassle and risks of DIY assembly, and ready to connect immediately.
Product Parameters:
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Brand: TMR
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Configuration: 3 Parallel × 5 Series (3P5S)
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Total Voltage: 18.5V
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Total Capacity: 6000mAh
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Cell Model: 18650 Li-ion Battery
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Single Cell Capacity: 2000mAh
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Nominal Voltage: 3.7V
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Discharge Rate: 1C
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Tab Layout: Pre-welded nickel tabs for easy connection
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Safety Design: Multi-layer safety protection, advanced spot welding
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Application: 18.5V Class Power Tools & High-Drain Devices
Applications:
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Heavy-Duty 18V Cordless Power Tools: The ultimate power source for retrofitting and powering high-torque 18V cordless drills, saws, and impact drivers for long work sessions.
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High-Performance LED Flashlights: Reliable, ultra-long-lasting power for high-lumen tactical flashlights and outdoor searchlights used in extended operations.
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Outdoor Portable Power Stations: A core high-capacity power module for building custom portable energy storage systems and outdoor power banks.
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RC Hobbies & Drones: Powers remote-controlled aircraft, heavy-lift drones, and large-scale RC car models requiring extended flight/run times.
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Smart Home & Security Systems: Reliable backup power for high-power wireless sensors and security systems requiring long standby times.
Frequently Asked Questions (FAQ):
Q1: What does "3P5S" mean in this battery pack?
A1: "3P5S" means the pack is arranged in a 3 Parallel × 5 Series configuration. It consists of 15 cells total: 5 sets of cells connected in series (to achieve 18.5V), with each series set having 3 cells connected in parallel (to achieve 6000mAh capacity). This provides significantly longer runtime than standard 5S2P (4000mAh) packs.
Q2: Are the nickel tabs already welded to the batteries?
A2: Yes! The nickel tabs are pre-spot-welded. There is no need for complicated soldering or spot welding equipment. You can connect them directly to your device's wiring.
Q3: What is the advantage of the 6000mAh capacity over standard 4000mAh packs?
A3: The 6000mAh capacity provides 50% more energy than standard 4000mAh 18V packs. This means your power tools and devices will run significantly longer on a single charge, perfect for heavy-duty, extended operations.
Q4: How do I charge this 3P5S 6000mAh battery pack?
A4: You must use a charger specifically designed for 18.5V/21V Lithium-ion battery packs. The charger must support a cut-off voltage of 21V. We recommend using a dedicated smart charger with over-charge protection.
Q5: Why should I choose this pre-welded pack over buying individual cells?
A5: Buying individual cells requires professional spot welding equipment and complex assembly skills, which is time-consuming and carries safety risks. This pre-welded pack eliminates the assembly work, ensuring correct connections and immediate ready-to-use convenience.
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.
