Home / Lithium ion Battery Pack
Lithium ion battery pack manufacturer
Lithium ion Battery Pack
3.6V–72V custom lithium-ion packs engineered around your product — free design, 7–12 day prototypes.
✔ IEC 62133 ✔ CE ✔ UL ✔ UN 38.3 ✔ UKCA ✔ MSDS
3.6V-72V
Custom Voltage
600+
Global Clients
7–12 Days
Prototype
15–35 Days
Mass Production
Must Read
Lithium Ion Battery Packs, Engineered Around Your Product
Flion Power is a Huizhou, China manufacturer focused on OEM and ODM lithium ion battery packs: 3.6V–72V custom packs, electric bike packs, portable-device packs under 100Wh, low and high temperature packs and lithium replacements for lead-acid.
A lithium ion battery pack is the power heart of every DC-powered product. When an off-the-shelf battery does not match your voltage, available space or duty cycle, a custom pack built around your design is usually faster, safer and cheaper than redesigning the product around a standard battery box.
Solution design is a free service. Send your electrical and mechanical requirements and our engineers confirm the cell configuration, BMS and housing design before any tooling starts — prototype to mass production, with certification paperwork handled for your market.
Buyer’s Guide
What Is a Lithium-Ion Battery Pack?
A lithium-ion battery pack is an assembly of individual lithium ion cells connected in series and parallel, plus the BMS, electronics and enclosure that make the energy safe and usable in a product. Four parts do the work:
1
Cells
Cylindrical 18650 / 21700 / 26650 / 32700 or prismatic cells arranged in an xS–yP layout. The series count sets nominal voltage; the parallel count sets capacity.
2
BMS / PCM
The protection board guards against over-charge, over-discharge, over-current and short circuit, and balances the cells. NTC temperature sensing and SMBus/UART/CAN communication are optional.
3
Housing
Custom plastic or metal enclosure — or PVC heat-shrink for compact builds — made to the L×W×H dimensions and mounting points on your drawing.
4
Connectors & protection
Connector model, wire gauge and length built to your harness, with IP54–IP67 sealing, insulation and vibration protection matched to the application.
Before You RFQ
Six Parameters We Tailor to Your Design
Send these six in your inquiry — even rough values are enough to start a solution. The full parameter list lives on our custom lithium ion battery pack page.
Voltage
Nominal platform from 3.6V to 72V; full-charge voltage has to match your motor or electronics and the charger you plan to use.
Capacity
Ah rating and the xS–yP cell layout are calculated from your runtime or energy (Wh) target.
Size
L×W×H envelope, mounting points and weight limit; cylindrical or prismatic cells arranged to use the cavity.
Discharge current
Continuous and peak amps for your real duty cycle; the BMS rating and weld layout are designed to it.
Operating temperature
Standard designs cover −20°C to +60°C; wide-temperature cells cover −40°C to +85°C for cold-climate products.
Connectors & certification
Connector, wire gauge and IP rating, plus CE / UL / IEC 62133 / UN 38.3 / MSDS / KC / UKCA for the markets you ship into.
Need a configuration that is not listed? Talk to our engineers →
Chemistry
NMC vs LiFePO₄: Choose Your Chemistry
Two lithium chemistries cover nearly every OEM project. Tell us your priorities — energy, lifespan or budget — and engineering confirms the fit.
| Parameter | NMC (18650 / 21700) | LiFePO₄ (LFP) |
|---|---|---|
| Energy density | Higher — more Wh in less space and weight; the default for portable products and light EVs | Lower — packs run slightly larger and heavier for the same energy |
| Cycle life | ~500–1,000 cycles typical (to 80% capacity, 25°C) | ~1,500–2,500+ cycles typical (to 80% capacity, 25°C) |
| Cost | Lower cost per Wh and a familiar, deep supply chain | Higher upfront cost, usually lower cost per cycle over a long service life |
| Best fit | Portable devices, e-bikes and compact, weight-sensitive designs | Lead-acid replacement, long-service-life and safety-first equipment |
Note: Figures are typical industry ranges at 25°C; exact values depend on cell model, discharge rate and operating temperature. Need help choosing? Read the 5-factor pack selection guide or raise it directly in your inquiry.
Category
One Manufacturer, Five Battery Pack Families
Our custom lithium ion battery packs cover five application families.
Custom Li-ion Battery Packs
3.6V–72V OEM/ODM packs built to your electrical and mechanical specification. From compact single-cell modules for portable electronics to high-voltage multi-series configurations powering e-mobility, robotics, energy storage, and industrial equipment, every pack is engineered around your application—not the other way around.
Choose your capacity, discharge rate, cell chemistry, connector, and enclosure, and our engineering team handles the rest: schematic design, BMS integration, thermal management, structural layout, and full compliance testing. Every pack ships with a customized Battery Management System offering overcharge, over-discharge, short-circuit, and temperature protection, along with optional SMBus, CAN, or RS485 communication.
Certified to UL, CE, UN38.3, and IEC62133 standards, and backed by automated production lines, strict incoming-material inspection, and 100% end-of-line testing, we deliver consistent, traceable quality from prototype to mass production. Whether you need a one-off sample or hundreds of thousands of units annually, we scale with you—on spec, on time, and on budget.
Electric bike lithium ion battery
24V / 36V / 48V / 52V packs with 18650 & 21700 cells and multi-protection BMS.
Portable device lithium ion battery
3.6V–14.4V, 2Ah–25Ah packs under 100Wh for drones, bait boats and meters.
Lead acid replace lithium battery
12V / 24V drop-in Li-ion and LiFePO4 packs matching lead-acid footprints.
low and high temperature lithium battery
Wide-temperature packs discharging reliably from −40°C to 85°C.
Quality
Built & Tested for OEM Orders
Every pack goes through the same in-house line, from incoming cell to shipping paperwork.
01
Cell sorting & matching
Incoming cells are sorted by capacity and internal resistance so only matched cells enter each series string.
02
Welding & assembly
Cell-to-cell nickel connections are spot- or laser-welded — never hand-soldered — for low resistance and vibration resistance.
03
Aging & testing
Finished packs go through aging, BMS protection-function checks, insulation and capacity confirmation before packing.
04
Cert & shipping docs
UN 38.3, MSDS and the CE/UL/IEC/KC/UKCA paperwork your market needs are prepared so the pack clears customs by air or sea.
Applications
Which Pack Family Fits Your Product?
Four application families, one engineering team — or start from the fully custom page.
Portable devices
Drones, bait boats, test meters and handhelds: 3.6V–14.4V, under 100Wh for carry-on and air shipping.
Light electric vehicles
E-bikes, scooters and motorcycles from 24V to 72V with multi-protection BMS and brand-ready housings.
Extreme-cold equipment
Military, outdoor and monitoring gear that must start at −40°C and survive wide-temperature duty.
Lead-acid replacement
12V/24V equipment upgrades with the same footprint and terminals at about one-third of the weight.
Inquiry to Production Process
One Manufacturer, Five Battery Pack Families
From Inquiry to Certified Production
Send inquiry
Collect and send your contact info and battery requirements
Design & Pricing
Free lithium battery solution design and quotation
Prototype
Confirm solution and make battery sample
7–12 daysShipping
Ship battery sample via UPS/Fedex/DHL
7–9 daysMass Production
Finishing mass production
15–35 daysCertificate
Finishing CE/UL/IEC62133/UN38.3 & MSDS certificates
2–4 weeksFAQ
Lithium Ion Battery Pack FAQ
Usually our MOQ is 20pcs. Prototype runs can start from a few pieces so you can bench-test the fit and BMS settings; unit pricing improves as order quantity increases. Send your expected order quantity and annual volume and we will quote the project accordingly.
Yes. Voltage, capacity, charge/discharge current, cell layout, housing dimensions (L×W×H), mounting points, connectors, wire length and labeling can all be built to your drawing. PVC heat-shrink, plastic or metal enclosures and private-label branding are all supported.
A custom prototype is typically ready in 7–12 days after the solution and quotation are confirmed. Mass production normally takes 15–35 days depending on configuration, quantity and certification status. Sample shipping by UPS/FedEx/DHL takes about 7–9 days.
CE, UL, IEC 62133, UN 38.3, MSDS, KC and UKCA can be provided according to your destination market; RoHS is available on request. Certification scope and schedule are confirmed per project before production, and UN 38.3 plus MSDS are the baseline documents for shipping.
Yes. Name-brand 18650/21700 cells (Samsung, LG, Panasonic and similar) can be used where your BOM requires them. Cost-driven projects can use qualified Chinese-brand cells instead; every build uses cells matched by capacity and internal resistance.
Standard BMS/PCM protection covers over-charge, over-discharge, over-current and short-circuit, with cell balancing. NTC temperature sensing is available, and communication options such as SMBus, UART or CAN bus can be added when your device needs them.
Lithium packs bulk order ship as regulated dangerous goods. Each pack is built to pass UN 38.3 and travels with an MSDS; we cooperate with forwarders experienced in Class 9 lithium shipping for both air and sea freight. Packs under 100Wh are the simplest for air shipment and sample movement.
We commonly work with T/T bank transfer under FOB, CIF or EXW Incoterms; payment for small prototype orders can be arranged through other methods on request. Exact terms are confirmed on the proforma invoice for each project.
Have a battery requirement? Get a free solution & quotation.
Send your voltage, capacity, dimension and duty-cycle requirements — free engineering review, no design fee.
Battery Solution | Prototype | Production | Shipping
info@flionpower.com | +86 189 1193 8253 | Huizhou, Guangdong, China
