For e-bike brands, distributors, importers, and conversion kit sellers, an e-bike battery RFQ is not just a request for price. It is the first technical control point in the project. A professional RFQ helps suppliers evaluate safety margins, mechanical fit, compliance risk, lead time, and whether your target cost is realistic.
Quick Answer: A good e-bike battery RFQ should explain the application, nominal voltage, capacity in Ah and Wh, controller current, BMS requirements, housing dimensions, connector type, charger, certification target, order plan, and warranty expectations. The clearer the RFQ, the more comparable the quotations become.
Key Takeaways for B2B Buyers
- Do not ask only for "48V 20Ah"; explain the bike type, controller current, housing, market, and order plan.
- Ask suppliers to separate cell cost, BMS, housing, charger, packaging, certification support, tooling, and warranty terms.
- Use the RFQ to filter serious engineering suppliers from sellers who only provide generic catalog prices.
- Add photos, drawings, labels, connector details, and sample expectations before asking for final pricing.
Buyer Decision Snapshot
| RFQ Item | Why It Matters | What to Provide |
|---|---|---|
| Application | Prevents under-designed packs for cargo, delivery, or high-current bikes. | Bike type, motor power, controller current, daily use case. |
| Electrical specification | Makes supplier pricing comparable. | Voltage, Ah, Wh, charge voltage, discharge current. |
| Mechanical design | Avoids sample failure caused by wrong housing or rail position. | Photos, drawings, dimensions, connector direction. |
| Compliance target | Affects documentation, labels, packaging, and testing cost. | Destination market and required certificates. |
| Order plan | Helps supplier quote realistic MOQ and lead time. | Sample quantity, trial order, annual forecast. |
Recommended Reading Path: If you are still comparing suppliers, read the sample testing checklist next, then use the pre-shipment inspection guide before approving bulk production. When your specification is ready, you can send the project details to GEB for RFQ review.
Start With the Application, Not the Battery Catalog
Many buyers begin with a simple sentence such as "We need a 48V 20Ah e-bike battery." That is not enough for a professional quotation. A 48V 20Ah battery for a city commuter bike, a cargo bike, a delivery fleet, and a mountain bike may require different cells, BMS ratings, discharge margins, housing structures, chargers, connectors, and warranty assumptions.
A stronger RFQ starts with the use case. Explain whether the battery is used for a complete e-bike, conversion kit, rental fleet, delivery vehicle, step-through frame, rear rack system, down tube system, or custom frame project. Mention the motor power, controller current, normal riding environment, expected daily mileage, and target buyer. These details help the supplier avoid under-designed packs.
Application details to include
- Bike type: city e-bike, cargo e-bike, folding e-bike, e-MTB, delivery bike, or conversion kit.
- Motor power and controller current: for example 250W, 500W, 750W, 1000W, 15A, 22A, or 30A.
- Target riding distance and assist level: commuting, long-range touring, delivery, or heavy-load usage.
- Market destination: US, EU, UK, Australia, or other markets with specific certification or labeling needs.
- Expected annual volume: sample order, first batch, monthly demand, and peak season forecast.
Define Voltage, Capacity, and Energy Correctly
Voltage and amp-hour capacity are the first specifications most buyers mention, but the more useful number is watt-hour capacity. Watt-hours show the energy stored in the battery: Wh = nominal voltage x Ah. A 36V 20Ah pack has about 720Wh, while a 48V 20Ah pack has about 960Wh. They both show 20Ah, but they do not provide the same energy.
In an RFQ, write the nominal voltage, fully charged voltage, capacity in Ah, and energy in Wh where possible. If you are replacing an existing model, include photos of the original battery label, connector, charger output, mounting rail, discharge port, and communication interface. For proprietary systems, compatibility information is more important than only voltage and capacity.
Recommended specification format
- Nominal voltage: 36V, 48V, 52V, or another confirmed value.
- Charge voltage: for example 42V for 10S lithium-ion, 54.6V for 13S lithium-ion, or chemistry-specific values.
- Nominal capacity: Ah and Wh.
- Cell chemistry preference: NCM, NCA, LFP, or supplier recommendation.
- Battery configuration: if known, such as 10S4P or 13S5P.
Specify Current Requirements and BMS Protection
A common procurement mistake is choosing a battery only by capacity and price. The pack may have enough energy, but the BMS may not support the controller current safely. If the controller demands more current than the battery can provide, the bike may cut off under acceleration, overheat on hills, or experience shortened cycle life.
Your RFQ should include standard discharge current, maximum continuous current, peak current, and expected peak duration. If you do not know these values, provide the controller label and motor rating. A professional battery supplier can recommend a suitable BMS margin. For fleet or cargo applications, current margin matters more because the load is heavier and the duty cycle is more demanding.
BMS functions buyers should request
- Overcharge and over-discharge protection.
- Over-current and short-circuit protection.
- Temperature monitoring during charge and discharge.
- Cell balancing for long-term consistency.
- Communication protocol, if required by the bike system.
- Fuse or secondary protection design for higher-risk applications.
Clarify Mechanical Design and Housing Requirements
Mechanical compatibility is one of the most common causes of sample failure. A battery can be electrically correct but still fail because the housing does not fit the frame, the rail position is different, the lock is not aligned, or the connector angle interferes with the bike structure.
If you need a replacement battery, send clear photos and measurements. If you are developing a new battery, provide drawings, 3D files, maximum available space, mounting requirements, waterproofing expectations, and cable exit direction. Do not assume that a supplier can identify a housing from a small product photo. For B2B projects, mechanical confirmation should happen before tooling, sampling, and printed labels.
Ask for the Right Quotation Breakdown
A useful quotation should not only show one final price. Buyers should ask suppliers to separate the major cost drivers so the quotation can be compared fairly. Different cell brands, BMS ratings, housing structures, chargers, packaging, certification support, and warranty terms can change the price significantly.
If one supplier is much cheaper, the buyer should check whether the quotation includes the same cell grade, same capacity, same BMS rating, same charger, same packaging, and same test procedure. A lower price may be real, but it may also mean a weaker design or missing compliance support.
Quotation items to request
- Cell brand, model, grade, and capacity.
- BMS specification and protection functions.
- Housing, connector, charger, lock, rail, and cable details.
- Sample price, tooling cost, and bulk order price tiers.
- Lead time for samples, trial order, and mass production.
- Packaging method, carton information, and export documents.
- Warranty period and after-sales responsibility.
Final Checklist Before Sending Your RFQ
- Application and bike type are clearly explained.
- Voltage, capacity, Wh, controller current, and motor power are included.
- Photos, drawings, dimensions, and connector information are attached.
- Target market and certification expectations are stated.
- Sample quantity, trial order, and annual volume are estimated.
- Quotation breakdown, lead time, warranty, and packaging are requested.
Questions to Ask Before You Accept a Supplier Quote
- Which exact cell model and grade are used in the quotation?
- What is the continuous and peak BMS current rating?
- Are charger, rail, lock, connector, labels, and packaging included?
- Which test records can be provided with samples and bulk shipments?
- What changes will affect the quoted price after sample approval?
Procurement Tip: If a supplier answers these questions clearly, the project is usually easier to sample, inspect, and repeat. If the answers stay vague, treat the quotation as preliminary rather than final.
Conclusion
A professional e-bike battery RFQ protects both the buyer and the supplier. It reduces wrong assumptions, speeds up quotation, improves sample accuracy, and creates a fair basis for comparing suppliers. For B2B buyers, the goal is not simply to receive the lowest price. The goal is to define a battery that fits the bike, passes safety expectations, supports the business model, and can be produced consistently.
Preparing an e-bike battery RFQ? Send GEB your voltage, capacity, motor power, controller current, housing photos, target market, and expected order volume. Contact GEB to request a practical engineering review before sampling.
FAQ
What is the most important information in an e-bike battery RFQ?
Voltage, capacity, motor power, controller current, housing dimensions, connector type, target market, and expected order volume are the most important items. Without these, suppliers must guess the design basis.
Should I ask for the cheapest cell option?
Not always. For B2B projects, cell consistency, BMS design, safety margin, warranty risk, and certification support can be more important than the lowest cell cost.
Can a supplier quote without drawings?
Yes, but the quote may be preliminary. For accurate sampling and mass production, photos, dimensions, connector details, and mounting information are strongly recommended.
How detailed should an RFQ be before asking for price?
It should be detailed enough for the supplier to understand electrical load, mechanical fit, market requirements, and order expectations. If the design is not final, ask for a preliminary engineering review before requesting a fixed bulk price.
