If you are sourcing lithium battery for ebike at scale — whether you are an ebike brand owner developing a new model, a wholesale distributor stocking replacement batteries, or an OEM buyer managing a yearly supply contract — you already know: the battery is the most expensive and the most complaint-sensitive part on an electric bike.
Choose wrong voltage, and the motor controller will be damaged. Choose wrong housing, and the battery will not fit the frame. Choose wrong supplier, and your after-sales cost will eat all your profit.
This guide is written for B2B buyers, not for end riders. It covers everything you need to specify, compare, and source ebike lithium battery in 2026: voltage selection, capacity calculation, cell types (18650 vs 21700), BMS configuration, housing and connector compatibility, certification, and how to evaluate an electric bike battery manufacturer in China.
Need a custom quote for your ebike model? Contact our engineering team →
Table of Contents
- Why Ebike Brands Are Switching to Custom Lithium Battery Packs
- Voltage Selection: 24V, 36V, 48V, 52V or 72V?
- Capacity and Range: How Many Ah Do Your Customers Need?
- Cell Type: 18650 vs 21700, and Why Cell Brand Matters
- BMS Configuration for Ebike Applications
- Housing Types: Downtube, Intube, Rear Rack and Bottle
- Connectors and Charger Compatibility
- Certifications Required for Import
- Cold Weather Performance: Don’t Forget Winter Markets
- OEM vs Aftermarket Replacement: Two Different Sourcing Models
- How to Evaluate an Electric Bike Battery Manufacturer
- Flion Power Ebike Battery Capabilities
- FAQ: B2B Ebike Battery Questions
Why Ebike Brands Are Switching to Custom Lithium Battery Packs
The global ebike market continues growing fast, and one trend is very clear: brands and distributors are moving away from generic catalog batteries toward factory-direct custom ebike battery pack solutions.
There are three reasons:
- Frame integration. Modern ebike frames are designed around the battery, not the other way around. Intube (inner tube) batteries, downtube batteries with custom dimensions, and semi-integrated designs all require a battery pack that is engineered to fit a specific frame drawing.
- After-sales cost control. Field failures of no-name battery packs — dead cells, BMS shutdown, connector melting — generate warranty returns, negative reviews, and chargeback disputes. A battery built with grade-A cells and a properly sized BMS reduces failure rate dramatically.
- Compliance pressure. The EU EN 15194 standard, US UL 2849 / UL 2271 requirements, and shipping regulations (UN38.3) are enforced more strictly every year. Buyers who cannot provide test reports are locked out of major sales channels.
For wholesale buyers selling replacement batteries, the logic is different but equally strong: riders with 3–5 year old ebikes need a replacement lithium battery for ebike that matches their original housing, connector, and voltage — and the original bike brand often charges 2–3x the factory price. That gap is your margin.
Voltage Selection: 24V, 36V, 48V, 52V or 72V?
Voltage must match the motor and controller. This is not a preference — a mismatched battery will damage the controller or simply not work.
| Voltage | Typical Motor Power | Common Application | Market Share (replacement market) |
|---|---|---|---|
| 24V | 200W–350W | Folding ebikes, city cruisers, older European models | ~10% |
| 36V | 250W–500W | City commuter ebikes, pedelecs (EU 25 km/h class) | ~35% |
| 48V | 500W–1000W | Most popular mid-motor and hub-motor ebikes | ~40% |
| 52V | 750W–1500W | High-performance commuter, fat tire ebikes (US market) | ~12% |
| 72V | 1500W+ | Speed pedelecs, off-road / hunting ebikes | ~3% |
Practical notes for buyers:
- 36V and 48V are your volume SKUs. Together they cover around 75% of replacement demand. If you are a distributor starting a battery line, start here.
- 52V packs are often 14S NMC configuration (nominal 52V, fully charged 58.8V). Do not confuse 52V with 48V — a 52V battery on a 48V controller can over-voltage the system.
- 24V demand is small but stable. Folding bikes and some elderly-oriented step-through models still use it. Our Reention 24V ebike lithium battery covers 5.2Ah–10.5Ah for this segment.
- For full details on our standard voltage range, see our electric bike lithium ion battery manufacture page.
Capacity and Range: How Many Ah Do Your Customers Need?
Capacity (Ah) decides range. Energy in watt-hours (Wh) = voltage × capacity, and real-world range depends on motor power, rider weight, terrain, and assist level.
Reference table for typical NMC ebike packs:
| Pack | Energy (Wh) | Estimated Range (pedal assist) | Typical Use |
|---|---|---|---|
| 36V 10.4Ah | ~374Wh | 35–45 km (22–28 miles) | City commuting, flat roads |
| 36V 13Ah | ~468Wh | 45–60 km (28–37 miles) | Daily commuter |
| 36V 15Ah (21700) | ~540Wh | 55–70 km (34–43 miles) | Long-distance commuter |
| 48V 13Ah | ~624Wh | 50–70 km (31–43 miles) | Mixed terrain |
| 48V 17.5Ah | ~840Wh | 70–95 km (43–59 miles) | Touring, hilly areas |
| 48V 21Ah (intube) | ~1008Wh | 90–120 km (56–75 miles) | Long range, fat tire ebikes |
| 52V 17.5Ah | ~910Wh | 80–110 km (50–68 miles) | High-performance |
Range figures are typical estimates under moderate assist (level 2–3), 75 kg rider, mixed terrain. Actual results vary.
B2B buying advice:
- For OEM ebike battery projects, capacity is a balance between range marketing claims and housing space. A 21700-cell pack fits ~30–40% more energy in the same volume than 18650.
- For wholesale electric bike battery replacement lines, the fastest-moving capacities are 36V 10.4Ah/13Ah and 48V 13Ah/17.5Ah. Stock these first.
- Never let a supplier quote capacity based on label alone. Ask for cell configuration (e.g., 13S4P with 3500mAh cells = 14Ah) and verify cell brand and model.
Cell Type: 18650 vs 21700, and Why Cell Brand Matters
Most ebike packs use cylindrical NMC cells. Two formats dominate:
| Item | 18650 Cell | 21700 Cell |
|---|---|---|
| Dimensions | 18mm × 65mm | 21mm × 70mm |
| Typical capacity | 2600–3500mAh | 4000–5000mAh |
| Energy per cell | ~9–12Wh | ~14–18Wh |
| Cost per Wh | Slightly higher | Lower (better energy density per pack) |
| Availability | Very mature, widely available | Increasingly standard for new models |
| Best for | Cost-sensitive replacement packs, smaller housings | Long-range and intube high-capacity packs |
Cell brand is where cheap packs cut corners. Grade-A cells from established manufacturers (Samsung SDI, LG Energy Solution, and reputable Chinese makers such as Lishen, EVE, BAK) have consistent capacity, low internal resistance, and verified cycle life. Grade-B or recycled cells may be 30–50% cheaper but show capacity fade within one season and create the majority of warranty claims.
A professional electric bike battery manufacturer will:
- Tell you exactly which cell brand and model is used (no “equivalent quality” vagueness)
- Provide cell datasheets and batch traceability
- Build packs with matched-cell grouping (capacity and internal resistance sorting)
- Back cell quality with written warranty terms
Our Shanshan 21700 36V 15Ah ebike battery is a good example of a modern 21700-based pack: 10S configuration, 15Ah capacity, intube-compatible form factor.
BMS Configuration for Ebike Applications
The Battery Management System (BMS) protects the pack and is the second most common source of field failures after cell quality. For ebike use, specify the following:
Essential protection functions (must have):
- Over-charge / over-discharge voltage protection
- Over-current and short-circuit protection (hardware-based, response under 50ms)
- Cell balancing (passive balancing is standard; ask for balance current, typically 30–80mA)
- Temperature sensors (NTC) for charge and discharge cut-off
Current rating — size it to the motor:
| Motor Power | Continuous Discharge Current | Recommended BMS |
|---|---|---|
| 250W–350W | 10–15A | 15A continuous / 30A peak |
| 500W–750W | 15–25A | 20–25A continuous / 40–50A peak |
| 1000W–1500W | 25–40A | 30–40A continuous / 60–80A peak |
Common buyer mistake: choosing a BMS rated too low for the motor to save cost. The BMS then cuts out under load (rider experiences “battery dies on hills”), or — worse — runs hot and fails. Always specify BMS current with 20–30% headroom over the controller’s maximum draw.
Optional smart features for premium models:
- Bluetooth battery monitoring app (SOC, cycle count, cell voltage diagnostics)
- CAN / UART communication with the motor controller (common for Bosch/Shimano-compatible mid-motor systems)
- LED or LCD battery level indicator on housing
Housing Types: Downtube, Intube, Rear Rack and Bottle
The housing decides which bikes your battery fits. For replacement-market buyers, housing compatibility is your single most important SKU decision.
| Housing Type | Mount Position | Typical Pack | Popular Brands/Series |
|---|---|---|---|
| Downtube (external) | Mounted on frame downtube | 36V/48V 10–20Ah | Hailong, Reention Poly, Silver Fish |
| Intube (integrated) | Slides inside frame downtube | 48V 17.5–25Ah | Reention Dorado, Kirin, Clouded Leopard |
| Rear rack | On rear carrier rack | 36V 13Ah, 48V 14Ah | City / commuter bikes |
| Bottle / seat tube | Bottle cage position | 36V small capacity | Lightweight road-style ebikes |
Intube batteries are the growth segment. New mid-drive ebikes almost universally use integrated intube packs for better aesthetics and weight distribution. Our Reention Dorado 48V 21Ah inner tube battery is a representative high-capacity option for this segment; the Dorado housing series also covers 52V 17.5Ah and 48V 25Ah (21700) variants.
Housing quality itself matters: the enclosure provides impact protection, IP-rated water resistance, and the locking mechanism that secures the battery to the frame. We work with professional enclosure manufacturers such as Shanshan Tech — you can read more in our article about Shanshan Tech battery enclosure solutions. For reference, our housings carry IPX5–IPX6 water resistance ratings.
For buyers developing a private-label housing, our custom lithium ion battery pack service covers 3.6V–72V design, custom tooling, and battery housing design from zero to one.
Connectors and Charger Compatibility
A battery with the right voltage but wrong connector is a return. Specify connectors explicitly on every purchase order:
- Discharge (power) connector: XT60 is common for 500W–750W bikes; XT90 or Anderson-style connectors for 1000W+ systems; many European brands use proprietary round plugs.
- Charge connector: often a separate DC port (DC 2.1/2.5mm, RCA, or XLR 3-pin for rack batteries).
- Signal connector: 5-pin or 6-pin JST/Higo connectors for controller communication, lights, or motor assist data.
- Polarity and pinout: always confirm with a wiring diagram — even “standard” connectors are wired differently by different bike brands.
We cover this topic in depth in our technical article on lithium ion battery connector types, including XT60/XT90, Anderson, and common OEM connector pinouts.
Charger notes:
- Lithium chargers must match chemistry and S-count: 36V NMC = 42V charge, 48V NMC = 54.6V, 52V NMC = 58.8V.
- Standard charge current is 2A (commuter packs) to 3–5A (large packs). Fast charging beyond 0.5C accelerates capacity fade — do not over-promise charge speed in your listings.
- For aftermarket sales, bundling the correct charger reduces compatibility complaints significantly.
Certifications Required for Import
| Certification | Purpose | Market |
|---|---|---|
| UN38.3 | Mandatory transport safety test (air/sea/land) | Global — no battery ships without it |
| MSDS | Material safety data sheet for logistics | Global |
| CE | EU safety compliance | European Union |
| RoHS | Hazardous substance restriction | European Union |
| UL 2849 / UL 2271 | Ebike system / battery safety standard | United States (increasingly required by retailers and cities) |
| EN 15194 | Ebike standard reference (battery safety aspects) | European Union |
| KC | Safety certification | South Korea |
| PSE | Electrical appliance safety | Japan |
B2B advice: request original test reports with the manufacturer’s name and model, not generic certificates. For Amazon and large retail channels in the US, UL 2849 compliance is effectively becoming a listing requirement — build this into your product roadmap now, not after a delisting notice.
Cold Weather Performance: Don’t Forget Winter Markets
If your market includes Canada, Northern Europe, or mountain regions, winter performance is a real sales factor:
- NMC ebike packs lose usable capacity below 0°C (32°F) — riders see noticeably reduced range in winter.
- Charging below freezing damages cells. A quality BMS blocks charging at low temperature (typically below 0°C / 32°F); cheap BMS units do not, and repeated cold charging permanently degrades the pack.
- For customers riding through severe winters, low-temperature optimized cells and optional heater modules are available.
For riders and fleets operating in extreme cold, we also produce dedicated low temperature lithium ion battery solutions with widened operating ranges. Mention your target climate in the inquiry so our engineers can specify the right cell grade and BMS thresholds.
OEM vs Aftermarket Replacement: Two Different Sourcing Models
Buyers often approach us without deciding which model fits their business. The requirements differ substantially:
| Factor | OEM Ebike Battery (new bikes) | Aftermarket / Wholesale Replacement |
|---|---|---|
| Design input | Frame drawing, controller spec, target range | Existing housing + connector compatibility |
| Housing | Custom or co-developed tooling | Standard series (Dorado, Hailong, Poly, etc.) |
| MOQ | Custom tooling typically 200–500 units per model | Standard packs from small batch |
| Lead time | 4–8 weeks (sample + tooling + production) | 1–3 weeks for standard configurations |
| Certification | Must match your brand’s target market reports | UN38.3/CE needed for import; market-specific as required |
| Branding | Your logo, custom label, custom packaging | Neutral or co-branded packaging |
| Price driver | Total BOM optimization at volume | Fast-moving SKU availability and reliability |
For OEM projects: involve the battery factory as early as possible — ideally at the frame design stage. Battery compartment dimensions set during frame design are expensive to change later. Send us your frame 3D file or compartment dimensions, motor voltage/power, and target range; our engineering team returns a pack design with cell configuration, BMS spec, and connector pinout.
For replacement distributors: start with a compatibility matrix (bike brand/model → housing → voltage → connector). Stock the 5–10 SKUs that cover 80% of your local bike parc, then expand. We can supply packs under the most common housing series with your label.
How to Evaluate an Electric Bike Battery Manufacturer
Trading companies and real factories look similar on Alibaba. Use this checklist:
Manufacturing capability:
- [ ] In-house pack assembly line (cell sorting, spot welding, BMS testing, aging test)
- [ ] Cell sourcing transparency — named brands with batch traceability
- [ ] 100% finished-pack testing: capacity test, BMS function test, insulation/hipot test
- [ ] Aging test (charge/discharge cycling) before shipment, not just power-on check
Documentation:
- [ ] UN38.3 test report for your exact model
- [ ] CE / RoHS / UL reports as required
- [ ] Per-shipment inspection report and pack serial numbers
Engineering support:
- [ ] Responds to technical questions with engineering detail (not just sales language)
- [ ] Provides wiring diagrams, BMS parameter sheets, charger specs
- [ ] Supports custom BMS firmware thresholds and connector pinouts
- [ ] Offers failure analysis on returned units (root cause, not just replacement)
Business terms:
- [ ] Clear warranty policy (2–3 years is standard for quality ebike packs)
- [ ] Stable lead times and spare-part availability across seasons
- [ ] Willingness to sign supply agreements for repeat volume
One caution on price: if a quoted pack is 30%+ below comparable A-grade cell pricing, the cells are almost certainly grade-B or recycled. The first season will be fine; the second season’s returns will not.
Flion Power Ebike Battery Capabilities
Flion Power is a China-based custom lithium battery pack manufacturer focused on B2B supply for ebike brands, distributors, and OEM customers worldwide.
What we supply:
- Voltage range: 24V, 36V, 48V, 52V, 72V (and custom configurations from 3.6V to 72V)
- Cells: 18650 and 21700 NMC cylindrical cells from established manufacturers; LFP available for specialty applications
- Housing series: Reention Dorado (intube), Reention Poly, Hailong downtube, Silver Fish, rear rack, and fully custom enclosures
- BMS: 15A–40A continuous ratings, optional Bluetooth, CAN/UART communication, temperature protection
- Water resistance: IPX5–IPX6 housing options
- Certifications: UN38.3, CE, RoHS, MSDS; UL 2849 support for customer programs
Our process for OEM projects:
- Inquiry (24h response): send frame/compartment dimensions, voltage, capacity target, connector requirements
- Design & quotation: cell configuration, BMS spec, housing solution, sample timeline
- Sample (2–3 weeks): hand-built sample pack with full testing and documentation
- Verification: fit check on your frame, charge/discharge data, certification pre-testing
- Mass production: assembly line production with 100% QC and aging tests
- After-sales: warranty support, failure analysis, spare pack availability
Browse our full ebike lithium battery product range or discuss a custom battery pack project with our engineers.
FAQ: B2B Ebike Battery Questions
Q: Can I use a 48V battery on a 36V ebike? A: No. The controller and motor are designed for a specific voltage range. Over-voltage will damage the controller, void the bike warranty, and create safety risks. Always replace with the same nominal voltage.
Q: 18650 or 21700 cells — which should I specify? A: For cost-sensitive replacement packs and smaller housings, 18650 is mature and economical. For new intube designs and long-range SKUs (48V 20Ah+, 36V 15Ah+), 21700 gives better energy density in the same space. We design around both; the choice depends on your housing volume and price target.
Q: What MOQ do you require for custom OEM ebike battery? A: Standard housing packs can start from small batch quantities. Fully custom tooling/housing projects typically require 200–500 units per model to absorb tooling cost. Contact us with your project for exact terms.
Q: How long is the warranty? A: Quality ebike lithium packs with grade-A cells typically carry a 2–3 year warranty. Actual terms depend on cell configuration, usage conditions, and order structure. We provide written warranty terms with every quotation.
Q: Can you match an existing brand housing (Dorado, Hailong, etc.) for the replacement market? A: Yes. We supply packs in the standard Reention Dorado/Poly, Hailong, Silver Fish and rack housings with your choice of cell grade, capacity, connector, and label. Send the original battery photo, label, and connector photo for fast compatibility confirmation.
Q: Do the batteries support Bluetooth or controller communication? A: Optional. We offer Bluetooth BMS with mobile app monitoring, and CAN/UART communication BMS for mid-motor systems. Specify this at the design stage — it cannot always be added to a finished pack.
Q: What is the typical lead time? A: Standard configurations: around 1–3 weeks depending on quantity and stock. Custom OEM with sample approval: 4–8 weeks total. Peak season (Sep–Nov for spring shipments) books early — place forecasts ahead.
Ready to Source Ebike Lithium Batteries?
Whether you are launching a new ebike model, stocking replacement batteries for your market, or building a long-term OEM ebike battery supply line, Flion Power’s engineering team is ready to support.
Contact us:
- 📧 Email: sales@flionpower.com
- 💬 Quote request: Send your specifications
What to include in your inquiry:
- Application: ebike model / motor power / voltage, or replacement target housing
- Required capacity (Ah) and target range
- Housing type (downtube / intube / rack / custom) and compartment dimensions
- Connector and charger requirements
- Quantity, target market (for certification), and timeline
We typically respond within 24 hours with technical feedback and pricing.
Last updated: 2026 | This article is part of Flion Power’s B2B Battery Sourcing Guide series. Related reading: lithium battery connector types, Shanshan Tech enclosure solutions, and custom lithium ion battery pack manufacturing.
