A custom OEM battery pack manufacturer designs, engineers, and produces lithium battery packs to your exact specifications — voltage, capacity, chemistry, form factor, BMS, and volume. The right manufacturer is a long-term engineering partner, not a catalog supplier. The wrong one is a single point of failure in your product program.
This guide covers everything an OEM engineer or procurement manager needs to evaluate a battery pack manufacturer: capabilities, minimum order quantities, lead times, and the questions that separate real manufacturers from distributors posing as manufacturers.
What Is a Custom OEM Battery Pack?
A custom OEM battery pack is a lithium battery pack designed and manufactured to a specific OEM's requirements rather than sold as a standard catalog product. Custom OEM packs typically involve:
- Custom voltage — any series configuration of cells to achieve the required pack voltage
- Custom capacity — any parallel configuration to achieve the required amp-hour rating
- Custom form factor — enclosure dimensions, connector type, and mounting interface designed to fit the OEM's product
- Custom BMS — Battery Management System programmed with the OEM's specific charge/discharge parameters, communication protocol (CAN, SMBus, I2C, RS-485), and protection thresholds
- Custom testing — the test standards your end market requiresor other testing required by the OEM's end market
How to Evaluate a Custom OEM Battery Pack Manufacturer
1. Who Owns the Battery Specification?
The program should name who controls the bill of materials, drawings, firmware, approved substitutions, test limits and revision history.
Ask for evidence tied to your actual program: supplier capability, process documentation, inspection and test records, traceability, corrective-action workflow and acceptance criteria.
2. What Is Their Engineering Capability?
Custom OEM programs require real engineering — cell selection, S×P configuration calculation, BMS specification, thermal modeling, enclosure design, and testing test preparation. Ask to speak with an application engineer before placing any order. If the sales process never involves an engineer, that is a red flag.
3. What Test Requirements Can They Support?
Defense, aviation, medical, consumer and industrial programs each call for different test standards and documentation.
A manufacturer who cannot support your required testing is not a viable partner for your program, regardless of price.
4. What Is Their Minimum Order Quantity?
MOQ varies widely. Some manufacturers require 500+ units for custom work. Others — including Lithium Battery Company — accept custom configurations starting at 25 units, with catalog designs available from 10 units. For programs in the prototype or early production phase, MOQ flexibility is critical.
5. What Is Their Production Capacity?
A manufacturer who can produce 1,000 units per year cannot support a program that scales to 50,000 units. Verify production capacity before committing to a long-term partnership. Ask about their current utilization, expansion plans, and how they handle demand spikes.
What to Include in a Battery Pack RFQ
A well-structured RFQ accelerates the quoting process and ensures you receive comparable quotes from multiple manufacturers. Include:
| RFQ Element | Details to Specify | |---|---| | Nominal voltage | e.g., 48V nominal | | Capacity | e.g., 100Ah | | Chemistry | LFP or NMC | | Cell format | Prismatic, cylindrical, or pouch | | Peak discharge current | e.g., 200A peak, 100A continuous | | Charge current | e.g., 50A max charge rate | | Operating temperature | e.g., -20°C to +55°C | | Enclosure dimensions | L × W × H in mm | | Connector type | e.g., Anderson SB175, XT90, custom | | BMS communication | CAN, SMBus, RS-485, or none | | testing required | the test standards your end market requiresetc. | | Annual volume | Units per year at full production | | Prototype quantity | Units needed for testing |
Frequently Asked Questions
Q: What is the minimum order quantity for a custom OEM battery pack? At Lithium Battery Company, custom OEM battery pack configurations start at 25 units. Catalog designs are available from 10 units. Volume pricing tiers begin at 100 units, with annual volume pricing for programs requiring 1,000+ units per year. Production capacity is confirmed program by program with the selected qualified partner.
Q: How long does it take to develop a custom OEM battery pack? A simple custom configuration — standard chemistry, standard cell format, custom voltage/capacity — typically takes 4–8 weeks from engineering kickoff to first article samples. Complex programs involving custom enclosures, or new BMS development take 12–24 weeks. Contact our engineering team with your requirements for a specific timeline estimate.
Q: How does Lithium Battery Company handle test requirements? Test and documentation requirements are scoped per program, based on the approved design and the markets you sell into.