Custom lithium battery packs · B2B

Custom battery packs, engineered around your application

Tell us your voltage, capacity, current, size and interfaces. We engineer the pack, build a prototype with no minimum order, and scale to production with documentation and quality reports.

Request an engineering review Configure in 3D
  • Prototypes with no MOQ
  • Typically 25–30 days to prototype
  • NDAA-compliant configurations on request
  • Named, genuine cells Samsung, LG, Molicel, Murata and more.
  • Prototypes, no MOQ Typically ready in 25–30 days.
  • QC report every shipment With batch and date-code traceability.
  • NDAA-compliant options For projects with applicable procurement requirements.

What we can customise

Every parameter, specified by you

Share what you know and leave the rest to us. Our engineers will propose the cell, configuration and BMS that meet your requirements.

  • Voltage

    From single cells to high-voltage series strings.

  • Capacity

    Parallel groups sized for your runtime.

  • Chemistry

    Li-ion (NMC/NCA) or LiFePO4.

  • Cell model

    Named cells, energy or high-drain.

  • Current

    Continuous and peak discharge.

  • BMS

    Protection, balancing, smart features.

  • Communication

    CAN, RS485, UART, SMBus, Bluetooth.

  • Enclosure

    PVC, ABS hard plastic or steel.

  • Dimensions

    Fitted to your maximum envelope.

  • Connectors

    Your preferred connector and wiring.

Applications

Applications we engineer for

Our lithium-ion packs are engineered for demanding, high-drain applications where reliability matters.

  • Logistics robots High-cycle packs for AMRs and AGVs running around the clock.
  • Drones Lightweight, high-discharge packs for longer flight times.
  • Medical equipment Stable, dependable power for critical devices.
  • Industrial power tools High-current packs built for heavy daily use.
  • E-mobility High-energy packs for e-bikes, scooters and light electric vehicles.
  • IoT devices Compact, long-life power for sensors, trackers and connected devices.
  • Security cameras Reliable backup and off-grid power for surveillance systems.
  • Energy storage Scalable packs for solar, backup and off-grid storage systems.
  • Marine & RV Deep-cycle lithium power for boats, campers and life off the grid.

How we work

From battery requirements to production

Every pack starts with your application, not a catalogue. Your requirements go through a structured engineering process, with a validated prototype before any production run.

  1. Requirements

    Voltage, capacity, current, size, environment and interfaces, captured in one technical brief.

  2. Cell selection

    Named cells chosen for your current, energy, lifetime and cost targets.

  3. Electrical & mechanical design

    Configuration, interconnects, fusing, thermal path, enclosure and connectors.

  4. BMS integration

    Protection, balancing and CAN, RS485, UART or SMBus communication matched to your system.

  5. Prototype

    A working prototype built to the agreed specification, with no minimum order.

  6. Testing & validation

    Capacity, protection and temperature checks, then validation in your own application.

  7. Documentation & certification

    A complete battery datasheet once the specification is locked. Certification is arranged where the design, application and destination market require it.

  8. Production

    Batch production with quality checks and a test report for every shipment.

Prototype-first

Validate before you scale

A low-risk path for new products: we review your requirements, build a prototype you can test in your own application, and only then plan pilot and production quantities. Batch quantities are assessed case by case, and we are happy to support innovative companies with small volumes.

  1. Engineering review
  2. Prototype
  3. Your validation
  4. Pilot run
  5. Production
Prototype MOQ
No minimum order
Typical prototype lead time
25–30 days
Batch production
Assessed case by case
Request an engineering review

Cell transparency

Cells we build with

Every pack is built with named cells from recognised manufacturers, and you receive the datasheet and SDS/MSDS for the cells used. Choose the cell, or let us recommend one for your current, energy and lifetime targets.

Cell Format Chemistry Capacity Max. continuous
IFR32700 LiFePO4 Cell 32700 LiFePO4 6000 mAh 18 A
Molicel INR-21700-P45B 21700 Li-ion Cell 21700 Lithium-ion 4500 mAh 45 A
Molicel INR-21700-P42A 21700 Li-ion Cell 21700 Lithium-ion 4200 mAh 45 A
Samsung INR21700-50S 21700 Li-ion Cell 21700 Lithium-ion 5000 mAh 25 A
Samsung INR21700-40T 21700 Li-ion Cell 21700 Lithium-ion 4000 mAh 35 A
Samsung INR21700-50E 21700 Li-ion Cell 21700 Lithium-ion 5000 mAh 9.8 A
Molicel INR-18650-M35A 18650 Li-ion Cell 18650 Lithium-ion 3500 mAh 10 A
Panasonic NCR18650GA 18650 Li-ion Cell 18650 Lithium-ion 3450 mAh 10 A
Molicel INR-18650-P28A 18650 Li-ion Cell 18650 Lithium-ion 2800 mAh 35 A
Murata (Sony) US18650VTC6 18650 Li-ion Cell 18650 Lithium-ion 3000 mAh 15 A
LG INR18650-HG2 18650 Li-ion Cell 18650 Lithium-ion 3000 mAh 20 A
LG INR18650-MJ1 18650 Li-ion Cell 18650 Lithium-ion 3500 mAh 10 A
Samsung INR18650-35E 18650 Li-ion Cell 18650 Lithium-ion 3500 mAh 8 A
Samsung INR18650-30Q 18650 Li-ion Cell 18650 Lithium-ion 3000 mAh 15 A
Samsung INR18650-25R 18650 Li-ion Cell 18650 Lithium-ion 2500 mAh 20 A

Need a cell that is not listed? Tell us in your request.

Browse all cells

Manufacturing & quality

Manufacturing, documentation and quality

We engineer your pack and manage its production, documentation and quality, so you deal with one technical partner from first spec to repeat orders.

  • Engineering-led, partner-built

    EEMENTOR ENERGY™ handles the engineering and project coordination. Production is carried out by our contract manufacturing partner in China.

    For qualifying programmes with specific procurement or country-of-origin requirements, US manufacturing options are available through manufacturing partners.

  • NDAA

    NDAA-compliant configurations

    NDAA-compliant battery configurations can be developed for projects with applicable procurement requirements. Component sourcing, country of origin and manufacturing requirements are reviewed for each configuration during the engineering stage.

    Tell us your procurement requirements in your request.

  • Documentation & certification

    Certification requirements depend on the battery design, the application and the destination market. Typical examples are UN 38.3, IEC 62133, IEC 62619, applicable UL requirements, SDS/MSDS and battery datasheets.

    • Available now: datasheets and SDS/MSDS for the cells we use.
    • For a specific product: a complete battery datasheet once the specification is locked. Test and certification results apply only to the product configuration that was tested.
    • Arranged for your project: certification of a custom battery, at additional cost, which may be reimbursed once your total ordered quantity reaches an agreed level.

  • Traceability & quality control

    Every shipment goes through complete quality checks, and the quality test report is provided to you. Batches and cell date codes are traceable.

  • Business customers only

    EEMENTOR ENERGY™ is a B2B supplier. We support registered companies and their projects, from start-ups to established OEMs, but cannot support private or pre-business projects.

  • Direct engineering contact

    You work directly with the engineers designing your pack. Led by engineers with 10+ years of experience across battery systems, electrical engineering and industrial projects.

Your details
Application
Project
Documentation and certification needed

Certification depends on the battery design, application and destination market. For a custom battery we can arrange it at additional cost, which may be reimbursed once your total ordered quantity reaches an agreed level.

Electrical requirements
Peak current
Mechanical & interface
Maximum permissible dimensions (length × width × height)
Anything else?

Required. We only use your details to respond to this request.

FAQ

Custom pack questions

Prototypes, quantities, lead times, documentation and certification.

Have a different question?

Ask an engineer directly. We are happy to help scope your project.

Contact us
Do you work with individuals or private projects?

No. EEMENTOR ENERGY™ is a business-to-business supplier. We support registered companies and their projects, including start-ups and small companies, but we cannot support private or pre-business projects.

Is there a minimum order quantity?

Not for prototypes: we can build a single prototype. For batch production we have no fixed rules. We assess each project individually and are happy to support innovative companies with small quantities.

How long does a prototype take?

A prototype typically takes around 25–30 days once the specification is agreed. Production lead times depend on the quantity and configuration, and we confirm them in your quote.

What documentation do you provide?

For the cells we use, we provide the cell datasheets and SDS/MSDS. For a custom battery, we provide a complete datasheet covering all specifications once the specification is locked with you, and a quality test report with every shipment.

Are custom batteries certified?

Not automatically. Certification requirements depend on the battery design, the application and the destination market, for example UN 38.3 for transport, IEC 62133, IEC 62619 or applicable UL requirements. Test and certification results only apply to the configuration that was tested. For a custom battery, we can arrange the required certification at additional cost, which may be reimbursed once your total ordered quantity reaches an agreed level.

Can you build NDAA-compliant batteries?

For projects with applicable procurement requirements, we can develop NDAA-compliant battery configurations. Component sourcing, country of origin and manufacturing requirements are reviewed for each configuration during the engineering stage. Production is normally carried out by our contract manufacturing partner in China, and US manufacturing options are available for qualifying programmes. Please mention your requirements in your request.

Can the pack include a BMS with communication?

Yes. We specify the BMS for your continuous and peak current, protection needs and communication interface, such as CAN, RS485, UART or SMBus.

Which cells can you use?

We build with named cells from recognised manufacturers, including the cells listed on this page. You can choose a cell or ask us to recommend one for your application.

Do you ship internationally?

Yes. Lithium batteries are packed and shipped in line with the applicable transport regulations for your destination.

Have a different question?

Ask an engineer directly. We are happy to help scope your project.

Contact us