15kWh Pre-assembled Version DIY Battery with BMS|Wistek(USA Stock)

We usually use UPS, Fedex, DHL or GLS express merchants. The logistics tracking number will be uploaded to your order page. If you find that the logistics information of your goods has not been updated for a long time, please contact us.

You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).

You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).

If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.

Wistek Energy Guarantee

Dear Valued Customers,

Thank you for choosing WISTEK! We understand the importance of reliable and safe battery cells. That's why we're committed to providing the highest quality products and exceptional customer service. This guarantee outlines our dedication to product quality and ensures a smooth experience for you.

Unmatched Quality:

• Authenticity: We guarantee 100% genuine EVE brand or new brand batteries with verifiable factory QR codes. No compromises on quality.
• Rigorous Testing: Every battery cell undergoes a thorough 100-point inspection by our professionals. This includes voltage, internal resistance, and capacity testing before delivery. You receive only the best performing cells.

Comprehensive After-Sales Support:

• Full Refund Guarantee: We offer a full refund on any used cells, B-grade cells, or swollen cells. Additionally, we accept returns and refunds for any other battery cell issues you may encounter.
• Easy Return Process: Returned batteries must be unused (with intact electrodes, no welding marks, no wear, and good appearance). We strive to make returns hassle-free.
• Transparency in Return Costs: Please note that buyers are responsible for return shipping costs.

What's Not Covered:

• Assembly-Related Issues: We cannot be held responsible for problems arising after assembly or during the assembly process, such as damage caused by incorrectly connected wires, charger failures, assembly errors, or unbalanced assembly.
• Improper Charging: Damage caused by battery bulging, welding, or using battery packs without a protection BMS during charging is not covered.
• Time Limitations: We guarantee the quality of individual batteries upon arrival. You have 15 days to test your cells. After this period, batteries are considered in good working order, and returns/refunds are not available.

Unparalleled Warranty:

• 5-Year Peace of Mind: Enjoy a 5-year warranty (from the delivery date) on all our battery cells. If a single cell's capacity falls below 80% of its initial capacity within 5 years, simply send us test pictures or a video, and we'll provide a replacement or a satisfactory solution.

WISTEK stands behind the quality and performance of our products. We are committed to earning your trust and providing a positive customer experience.