Last updated October 3, 2026. Mandatory local consumer rights continue to apply where they provide greater protection.
Shipping Policy
Standard paid orders are normally prepared for dispatch within 3 business days after payment clears and all required shipping information is received.
The Battery Kit (With Caster) and 6U Battery Kit are in stock at our Poland warehouse. They are sold and delivered only to addresses within the European Union, with free shipping to eligible EU destinations.
Checkout cannot be completed for an order containing either battery enclosure kit when the delivery address is outside the European Union. This restriction also applies to mixed carts that contain a kit and other products.
Other products receive free shipping at checkout under the general store policy unless a written project quotation states different terms.
Transit times are estimates. Carrier capacity, weather, holidays, remote-area service, and export controls may cause delays.
Customers must provide complete and accurate recipient, address, postal code, phone, and email information.
Returns & Refunds
For standard, non-customized products, request a return within 7 calendar days after documented delivery, unless mandatory local law provides a longer period.
For the Poland-stock Battery Kit (With Caster) and 6U Battery Kit delivered to EU consumers, you may notify us of withdrawal within 14 calendar days after delivery, subject to mandatory-law exceptions. Email zhou@jkbms.net before returning the goods.
Email zhou@jkbms.net before returning an item. Products must be unused, uninstalled, unmodified, complete, and safely packed unless the return concerns a verified defect.
Returns are sent back by mail. We do not supply prepaid return labels, so return shipping is arranged and paid for by the customer.
Customized, configured, branded, project-engineered, or made-to-order products are non-cancellable and non-returnable after production or procurement begins, except for verified defects or mandatory legal rights.
Approved refunds are normally returned to the original payment method after inspection.
Warranty
Supplied battery enclosures, BMS products, and energy storage hardware carry a one-year limited warranty from documented delivery unless a written quotation states otherwise.
The warranty covers verified defects in materials or workmanship under correct installation and use within published specifications.
Incorrect wiring, cell selection, installation, configuration, over-voltage, over-current, water ingress, impact, unauthorized modification, and use outside specifications are excluded.
Energy storage equipment must be installed and commissioned by qualified personnel.
Terms of Sale
Prices are in United States dollars. The final amount and included items are those shown at checkout or in the applicable written quotation.
Battery cells are not included with enclosure kits unless expressly stated.
An order may be reviewed for payment, compatibility, shipping, or description errors before acceptance and dispatch.
A product-specific quotation, signed agreement, approved drawing, specification sheet, or written order confirmation takes priority over these general terms.
Safety
Battery and high-voltage equipment can cause fire, electric shock, arc flash, burns, explosion, and serious injury when incorrectly installed or operated.
Only qualified personnel should assemble cells, configure BMS hardware, commission systems, and work on energized equipment.
Confirm cell dimensions, chemistry, voltage, current, protection devices, insulation, grounding, communication, ventilation, and local electrical requirements before use.
Privacy
Contact and delivery information is used to process orders, provide support, prevent fraud, comply with legal requirements, and arrange payment and shipment.
Customer accounts store your name, email address, password hash, verification records, and session information. Essential secure cookies keep you signed in. Verification and password-reset emails are sent when requested. Passwords are not stored as plain text.
New orders placed while signed in are linked to your account. Guest orders and previous orders are not automatically linked by email. Account pages do not load Google Analytics or third-party page translation.
PayPal processes payment details under its own privacy terms. This website does not store full card details.
With your optional statistics consent, JKBMS records a random browser session, known public entry page, search-source category, presence of Google ad-click markers (not their values), screen-width category, and shopping steps. We do not include your name, email, address, full referrer URL, query strings, IP address, or browser user-agent in these statistics. Anonymous step records are retained for up to 90 days and cleared from the active store on the next statistics request or admin read after expiry; storage limits may remove them earlier.
The random session is stored in sessionStorage only after consent, expires after 24 hours, and is cleared when you withdraw consent or close the tab. A limited source summary may be saved with an order you place after consent; this summary follows the order record retention. Verified payment counts come from server-checked orders, not browser purchase claims. You can reject or withdraw optional statistics in Cookie settings. Google Analytics runs only when configured and accepted; advertising storage and personalization remain disabled.
Contact zhou@jkbms.net for privacy questions or requests.