FAQ

YULIDA operates as a Shenzhen-based power bank manufacturer serving B2B OEM and ODM projects. Buyers can review the factory capabilities and production workflow, then request model-specific production, testing and compliance information during supplier verification.

Available platforms include magnetic wireless power banks, TFT-display models, AC-plug power banks, built-in-cable designs, outdoor or solar models, metal power banks and multi-function charging products. Review the power bank product categories and shortlist models by capacity, output, ports, size, weight and target market.

Start with the use case and sales channel rather than appearance alone. Define the required battery energy, USB-C input and output, charging protocols, wireless charging power, cable or AC-plug requirements, enclosure material, product weight, target retail price and destination-country compliance scope. YULIDA can then identify an existing platform or assess whether deeper development is required.

For device fit, check the wireless charging compatibility guide or USB-C PD specification checklist. Record the devices, cables and charging modes that the sample must support.

Send the preferred model or product type, capacity, output power, required ports and protocols, quantity, target market, logo method, color, packaging requirement, compliance documents, delivery destination and requested schedule. A reference image is useful, but it should be accompanied by written technical requirements so suppliers quote the same scope.

Use the power bank RFQ checklist to put the specification, quantity breaks, document scope and delivery terms in one request. Ask suppliers to identify sample charges, tooling, testing and freight separately so quotations can be compared on the same basis.

YULIDA’s standard MOQ depends on the customization level. Logo and standard packaging projects start at 500 units. Product-level customization typically starts at 1,000 units. New tooling or original structural development typically starts at 2,000 units, subject to engineering review and quotation.

Yes. Available OEM and ODM options depend on the model and may include capacity, output power, wireless charging, display, enclosure material, color, logo, packaging, PCBA, and tooling development.

Separate branding, configuration changes and new development in the OEM/ODM project scope. Use a written product specification to record what changes and how the result will be checked.

Yes. An existing platform is usually the faster, lower-risk route when its electrical design, size and feature set already match the project. Logo, color and packaging changes can often be handled without new structural tooling. A new enclosure or major electronic change requires feasibility review, defined ownership of tooling and additional validation.

If tooling is needed, agree who pays for and owns it, where it is held, maintenance responsibility and any exclusivity in the manufacturing agreement. Custom development alone does not establish exclusive ownership.

Yes. Samples can be arranged for evaluation before mass production. Sample timing, fees, courier options, and any credit against a later bulk order are confirmed for the selected model in the quotation.

Identify whether you need a stock evaluation unit, a branded sample or a pre-production sample matching the final specification. Check charging behavior, usable output, finish, labels and packaging, then retain the approved sample and revision record. Follow the sample approval checklist.

Lead time depends on the selected model, customization scope, order quantity, material availability, and approval schedule. Sampling and production timing are confirmed in the quotation and begin after the required design, specification, and payment approvals are complete.

Ask for separate dates for sample preparation, sample approval, material readiness, production, inspection and dispatch. Confirm whether quoted days are working or calendar days and whether tooling, testing and transport are included. Record the required approvals and delay triggers in the order agreement.

Options depend on the enclosure material and model. Common routes may include printed or laser-marked logos, color matching, custom sleeves, manuals, labels, inserts and retail cartons. Confirm the artwork format, print area, color standard, packaging structure, barcode and legal label information before approving a sample.

Core checks cover electrical function, charging and discharging performance, temperature behavior, and cosmetic finish. The full inspection, aging, and reliability plan depends on the model and order specification.

Buyers can review the documented power bank quality-control process and agree model-specific acceptance criteria before mass production.

Compliance is model- and market-specific. Depending on the selected product and destination, available evidence may include CE-related documents, FCC reports, RoHS reports, UN 38.3 transport-test evidence, China CCC documentation, or other market-specific reports. Buyers should request current files for the exact model.

Use the document verification guide to check each file against the quoted product. For a destination-specific starting point, see the power bank compliance guide by country.

Request the current report, certificate or test summary for the exact model, battery configuration and destination market. Compare model numbers, applicant or manufacturer names, laboratory details, dates, standards and scope. Some documents can be reviewed during supplier qualification, while project-specific testing may require a confirmed specification and separate quotation. See the certifications and compliance guide.

No. UN 38.3 addresses lithium-cell and battery design-type testing for transport. It is not a universal product-safety or market-access certificate. The finished product may still need electrical, EMC, radio, chemical, labeling or other evidence depending on its features and destination.

The printed battery capacity is normally measured at the internal cell’s nominal voltage. USB output operates at another voltage and passes through conversion circuitry, so usable energy is reduced by conversion loss, cable loss, load, temperature and cut-off settings. Compare suppliers using Watt-hours and a defined test method rather than unrelated mAh figures.

Ask for the output voltage, load, ambient temperature, cut-off condition and measured Wh in the test record. The power bank capacity testing guide explains how to compare battery energy and delivered output under stated conditions.

Approved specifications should be placed under change control. Record the sample revision, battery cell, protection circuit, firmware, enclosure, accessories, labels and packaging. Any proposed substitution should be disclosed and reviewed for performance, compliance and transport-document impact before production.

Attach the approved product specification and revision to the order, and define who can approve changes. Ask the supplier to identify the affected batches and update the relevant test and document records before releasing a changed product.

Payment terms, Incoterms, and shipping methods are confirmed in the quotation. Options depend on order size, lithium-battery transport rules, destination requirements, and carrier acceptance.

Request the payment milestones, currency, named delivery place, agreed Incoterm and responsibility for freight, duty and insurance in writing. State whether the required date means factory dispatch or arrival at the destination. See the RFQ checklist for the commercial information to include.

Yes, subject to the current dangerous-goods rules, carrier acceptance and route restrictions. Power banks are normally treated as lithium-ion batteries for transport. Air and sea shipments use different rule sets, packaging provisions and documents. Review the power bank shipping guide before fixing a delivery schedule.

The responsibility should be defined in the quotation and shipping plan. The factory supplies accurate product, battery, Watt-hour, quantity and package information; a qualified dangerous-goods forwarder or trained shipper prepares or reviews the route-specific declaration and package controls. The buyer should confirm destination import and delivery requirements.

Required information depends on the model, battery, features, destination and sales channel. Typical controls include model identification, electrical ratings, manufacturer or responsible-party information, warnings and applicable compliance marks. Transport marks belong on the shipping package, not on the product as decoration. Use the power bank label checklist for planning.

After-sales terms are confirmed in the quotation for the selected model and order. Buyers should provide batch details and supporting test information when reporting an issue so the cause and remedy can be reviewed.

Before ordering, agree the warranty period and start date, claim evidence, exclusions, response process and responsibility for inspection, replacement, credit and transport costs. The warranty claim guide explains how to document an issue for investigation.

Provide the purchase order, model, batch or date code, affected quantity, failure rate, clear photos or video, charging equipment used, test conditions and measured results. Keep affected units and packaging available for review. This separates isolated handling damage from a repeatable product or batch issue.

Use the failure analysis and traceability checklist to connect the reported symptom to the sample, test setup and affected production lot.

Use the contact form or email [email protected]. Include the model or product type, required capacity and output, quantity, target country, customization level, compliance scope, delivery destination and requested schedule. The sales team can then respond against a defined project rather than a generic product request.