We offer free shipping to all locations within our carrier's delivery range.

If your postal code is not covered by our carrier, we will notify you before processing your order.

We understand that different platforms may have different pricing due to their respective strategies and fee structures.

To protect your rights as much as possible, if you find a lower price for the exact same lithium battery product on another platform within 7 days of your purchase, simply take a screenshot showing the lower price (including the platform name, product listing, and date) and send it to service@humsienk.com.

We will match the lower price through our cross-platform price matching policy.

Please note: The lower price must be from an authorized seller, and the product must be identical (same brand, model, capacity, and condition). Promotional prices from flash sales or limited-time events may be reviewed on a case-by-case basis.

No, we do not ship to PO Box addresses. Our carriers are FedEx and UPS, both of which require a physical street address for delivery of lithium battery products due to shipping safety regulations.

If you have already placed an order using a PO Box address, please contact us immediately at service@humsienk.com to update your shipping information with a valid physical address. Orders shipped to a PO Box may be delayed or returned to us, and additional shipping fees may apply for re-delivery.

📦 Please double-check your shipping address at checkout to avoid delivery issues — especially during the busy holiday season.

Orders placed during the holiday promotion are typically processed within 3–5 business days. Due to carrier volume surges (e.g., Black Friday, Christmas), delivery may take 3–5 additional business days than usual. You will receive a tracking number via email once shipped