OEM / ODM LiFePO4 Battery Process: From Inquiry to Branded Pack
Quick answer: A custom lithium battery programme runs in five stages — discovery, design, prototype, certification and production — with a defined deliverable and decision gate at each. Private label on an existing platform can ship in weeks; a fully custom pack with new tooling and certification typically runs twelve to twenty weeks from design freeze. The single biggest schedule risk is discovering certification requirements after tooling, which is why we identify them during discovery.
Why the process matters more than the product
Two manufacturers can build the same pack from the same cells and deliver very different outcomes. The difference is almost never in the assembly — it is in what gets decided when, and whether anyone checks it before money is committed.
The failure mode in custom battery work is consistent: a requirement surfaces late, the design has to be revisited, and the schedule slips by months rather than weeks. Certification is the classic example, but protocol mismatch, thermal behaviour and cell availability all do the same thing. A process with explicit gates exists to surface those things early, when they are still cheap to fix.
Stage 1 · Discovery
Your input: load profile, mechanical envelope, operating environment, target certification, annual volume.
What happens: we assess feasibility, identify the applicable standards for your market, flag constraints, and quote. Feasibility is not a formality — if the energy target cannot fit the envelope, or the certification path is longer than your timeline allows, that is the moment to find out.
Your deliverable: feasibility assessment and quotation, including MOQ, unit price, tooling cost and schedule.
Gate: you approve the commercial terms. Typical duration: one to two weeks.
Stage 2 · Design
What happens: cell selection and matching strategy, electrical architecture, BMS specification and firmware, thermal design, mechanical layout and enclosure. Thermal simulation is included where continuous load justifies it. All work is NDA-protected.
Your deliverable: schematic, BMS logic definition, mechanical drawings, thermal analysis, bill of materials, and a defined certification path.
Gate: design review and sign-off. Expect two to three rounds; the design is not frozen until you are satisfied with the test implications, not just the drawings. Typical duration: two to four weeks.
Stage 3 · Prototype
What happens: prototypes are built and tested. Critically, they are built on the production line using production tooling and processes, not hand-assembled in an engineering lab.
This distinction sounds like a detail and is not. A hand-built prototype validates the design but says nothing about whether the design can be manufactured consistently — and manufacturability is where volume programmes fail. A prototype that behaves differently from production product is worse than no prototype, because it validates the wrong thing.
Your deliverable: prototype units plus test data covering electrical performance, thermal behaviour under load, protection threshold validation, and communication handshake.
Gate: test data signed off. Typical duration: three to six weeks.
Stage 4 · Certification
What happens: testing and documentation for your target market. Common requirements include:
| Standard | Scope | Where it applies |
|---|---|---|
| UN38.3 | Transport safety | Required for all lithium battery shipping — air, sea, road |
| IEC 62619 | Industrial and stationary safety | Industrial equipment, stationary storage — widely accepted internationally |
| UL 1973 | Stationary and motive battery safety | North American market requirement |
| UL 9540 / 9540A | System and thermal runaway propagation | North American stationary storage, often required by AHJ |
| CE | European conformity | European market access |
| RoHS | Substance restriction | European market, sometimes requested elsewhere |
Your deliverable: test reports and certificates, issued in your name for OEM and private-label programmes where the standard permits.
Gate: certification evidence accepted. Typical duration: four to ten weeks — frequently the longest single stage, and the one most often underestimated.
Stage 5 · Production
What happens: volume production with incoming cell inspection, batch matching, assembly, and end-of-line test on every unit. Serial numbers tie each unit to its cell lot and test record.
Your deliverable: finished product under your label or neutral, per-unit test data, and shipping documentation prepared with the order rather than after it.
Gate: first article approval, then release to volume. Typical duration: four to eight weeks to first shipment, then repeat orders at standard lead time.
Timeline summary
| Programme type | Typical duration | Longest stage |
|---|---|---|
| Private label on existing platform | 4–8 weeks to first shipment | Artwork and packaging approval |
| ODM — modifications to existing platform | 8–14 weeks | Prototype and validation |
| Full custom — new design, existing certification path | 12–18 weeks | Design and prototype |
| Full custom — new design and new certification | 16–28 weeks | Certification |
What delays programmes
- Certification identified late. Standards impose design consequences. Found after tooling, they mean redesign. Identify them at discovery.
- Incomplete load profile. “100 Ah” is not a requirement. Peak current, duty cycle and ambient range are what the design is built against.
- Protocol mismatch discovered at integration. Provide the communication specification during discovery.
- Slow artwork or documentation approval. Common in private label. Start it in parallel with engineering.
- Cell availability. Large-format cells and specific grades have lead times. Confirm availability before freezing the design.
Related routes
- OEM & ODM overview — capabilities and what we customise
- Custom pack design — the engineering detail behind stage 2
- Private label — the fastest route to market
- Certification guide — standards explained for importers
Frequently asked questions
How long does a custom battery programme take?
Private label can ship in four to eight weeks. A fully custom pack with new certification typically runs sixteen to twenty-eight weeks. The range is wide because certification dominates the schedule — confirming your target market’s standards early is the most effective way to shorten it.
Can stages overlap?
Partly. Certification planning and documentation can begin during design, and packaging artwork can run in parallel with engineering. Tooling should not begin before design freeze, and production should not begin before first article approval.
What if we need to change the design mid-programme?
Changes are possible and normal, but their cost depends on timing. Changes during design are inexpensive. Changes after tooling are expensive. Changes after certification may require recertification. This is why the design gate exists — it is the last point where change is cheap.
Do we get test data for every unit?
Yes. Every unit receives an end-of-line test and the record is keyed to its serial number. That means a field issue years later can be traced to the cell lot and the original test data, which matters for warranty handling and for any product safety investigation.
Who owns the design?
For OEM programmes where you supply the design, you own it. For ODM programmes we develop for you, ownership terms are set out in the programme agreement — designs developed for a customer are not offered to other customers in any case.
Preparing for discovery
The discovery stage moves faster and produces a tighter quotation when certain information is available up front. You do not need all of it, but each item removes an assumption.
Electrical requirements
- Nominal system voltage and acceptable operating window
- Continuous current and peak current, with duration for peaks
- Daily energy throughput or duty cycle
- Required runtime or energy target
- Charging method and maximum charge rate
Mechanical and environmental
- Dimensional envelope, or an existing drawing or 3D model
- Mounting orientation and method
- Weight limit, if any
- Ambient temperature range, including storage
- Indoor or outdoor, and required ingress protection
Commercial and regulatory
- Target market and applicable standards
- Annual volume and expected ramp
- Target unit price, if you have one — it shapes the design
- Launch date or deadline
- Whether branding is required (OEM, private label or neutral)
After production starts
The programme does not end at first shipment. Two things matter for the long term.
Traceability. Serial-numbered test records mean a field failure can be traced to the cell lot, the production batch and the original test data. This is what makes warranty handling fact-based rather than speculative, and it is what a product safety investigation will ask for.
Change control. Components go end-of-life, and cell availability shifts. A manufacturer who substitutes a cell without telling you has changed the product without your knowledge. We notify proposed changes and revalidate before substituting — the alternative is discovering the change when field behaviour differs.
Can we audit the facility?
Yes. Factory audits are welcome and can be conducted in person or remotely. We can also provide process documentation, quality system records and test procedures in advance for buyers who want to review before visiting.
What happens if a component goes end-of-life?
We notify you and propose alternatives with supporting data, then revalidate before any substitution reaches production. Silent substitution is a real risk in this industry, particularly with cells, and it is worth asking any supplier how they handle it.
How are repeat orders handled?
Once a design is frozen and validated, repeat orders run at standard production lead time — typically four to eight weeks depending on configuration and cell availability. No re-engineering, no re-certification, no new tooling.
How to compress the schedule
Most buyers ask how to make a programme faster. The honest answer is that the schedule is largely set by decisions made in the first two weeks, and there are only a few things that genuinely compress it.
- Confirm certification at discovery. The single highest-leverage item. Standards identified early are designed to; standards identified late are retrofitted.
- Start artwork and documentation in parallel. They do not depend on engineering, and they are frequently the reason a ready product sits waiting.
- Decide on an existing platform where possible. Modifying a validated design removes most of the prototype and certification cycle.
- Provide a real load profile. Guessing at current and duty cycle produces a design that has to be revisited.
- Approve gates promptly. Programmes rarely slip in engineering; they slip waiting for sign-off.
What does not compress the schedule is skipping validation. Every week saved by shipping an unvalidated design is repaid with interest in warranty claims.
