Top 10 Custom Battery Manufacturers in 2026

When making a selection of custom battery manufacturer there are other factors to consider than just comparing capacity and cost. OEMs need to take into account battery chemistry, the BMS design, integration of enclosure, certifications, prototyping, production volume and long-term supply stability.

GLOFLUX Energy, Inventus Power, Alexander Battery Technologies, Epec, Custom Power, Grepow, Large Power, A&S Power, Tritek and Excell Battery are the top custom battery manufacturers in 2026 based on manufacturing capabilities and suitability of the project.

This list does not reflect an absolute ranking. There are many different applications and manufacturing demands that each manufacturer will serve.

Custom Battery Manufacturer Comparison

GLOFLUX Energy

Best for OEM/ODM lithium battery applications that require flexibility.

GLOFLUX Energy esigns and builds custom lithium-ion, lithium-polymer, LiFePO₄ and rechargeable battery packs for medical devices, point of sale (POS), portable electronics, industrial equipment, robotics and energy storage applications.

The engineering support it provides spans cell selection, series/parallel configuration, PCM/BMS integration, connectors, wiring, enclosure design, prototyping and production. GLOFLUX is especially well suited to OEMs who require a fast development partner for small to medium volume projects prior to scale up.

Customers can submit voltage, capacity, current, dimensions and certification requirements through its custom lithium battery solution service.

Inventus Power

Best for very structured OEM programs in the global market.

Inventus Power produces custom battery packs, battery management systems, battery chargers and battery power supplies. It has in-house engineering, testing, certification assistance, a worldwide manufacturing network and more.

With over 2,000 designs in its portfolio, the company is a good choice for complex applications like medical, industrial, motive and commercial. Visit Inventus Power.

Alexander Battery Technologies

Best for established UK and European OEMs

Alexander Battery Technologies offers bespoke and build to print battery packs to an OEM. It enables lithium-ion and lithium-polymer projects in design and development, and up to commercial-volume production.

The company is well suited to medical, industrial, e-mobility and other regulated applications requiring repeatable manufacturing processes. Visit Alexander Battery Technologies.

Epec

Best for multi-chemistry engineering support

Epec designs custom battery packs using lithium-ion, lithium-polymer, NiMH, NiCd, lithium primary and alkaline chemistries. Its capabilities include enclosure development and smart BMS integration using communication protocols such as SMBus, I²C, CAN bus and RS485.

Epec serves medical, military, aerospace, industrial and portable-device markets, making it relevant to OEMs with complex electrical and mechanical requirements. Visit Epec.

Custom Power

Best for harsh environments and critical equipment

Custom Power designs and manufactures primary and rechargeable lithium battery packs for a wide range of applications, including medical, military, marine, robotics, oil and gas, and aerospace.

It's strength is in designing battery packs to meet rigorous temperature, vibration, shock, size and regulatory requirements. It is appropriate for use when reliability in the desired application is more important than lowest unit cost. Visit Custom Power.

Grepow

Best for high-discharge and special-shaped batteries

Grepow produces lithium-polymer (LiFePO₄), NiMH battery products, and custom-shaped battery products. It's most renowned for high rate batteries for drones, robotics, RC gear, wearables and mini electronics.

OEMs requiring unusual cell shapes, low-temperature performance or high discharge rates may consider Grepow. Visit Grepow.

Large Power

Best for specialized industrial applications

Large Power offers custom cells, battery packs, BMS, chargers, as well as power systems for medical, robotics, security, industrial and harsh-environment equipment.

It provides services in areas of requirements analysis, chemistry selection, protection-system development, pack construction and the testing of applications. It is applicable to projects where a typical catalog battery is not an effective solution.. Visit Large Power.

A&S Power

Best for compact LiPo battery projects

A&S Power offers lithium-polymer, lithium-ion and LiFePO₄ battery solutions. It provides flexibility in customizing dimensions, capacity, wiring, connectors, protection circuits and packaging.

Its battery products are commonly used in medical devices, POS terminals, wearables, lighting products and consumer electronics. The company can be considered for projects that demand thin or compact rechargeable batteries.. Visit A&S Power.

Tritek

Best for light electric vehicles

Tritek develops lithium-ion batteries and lithium-ion BMS (Battery Management System) solutions for electric bicycles, electric motorcycles, cargo bikes, water equipment and energy systems.

While manufacturers are primarily targeting small portable devices, Tritek can be more successful in 36V – 72V mobility batteries, connected BMS functions and hot-swappable battery systems. Visit Tritek.

Excell Battery

Best for medical and smart batteries

Excell Battery provides OEM battery solutions based on lithium ion, NiMH and other chemistries. It has engineered smart battery technology and solutions for Class I, II and selected Class III medical equipment.

It's a pertinent supplier for medical manufacturers in need of fuel gauging, battery communication and close operating environments.. Visit Excell Battery.

How to Select the Right Manufacturer

Before requesting a quotation, prepare the following information:

• Nominal and charging voltage
• Required capacity or operating time
• Continuous and peak current
• Maximum dimensions and weight
• Charging method
• Operating temperature
• Connector and communication requirements
• Target certifications and sales markets
• Prototype quantity and annual demand

The optimal supplier shall describe proposed chemistry, protection, thermal considerations and certification path. Engineering response, traceability, prototype testing and consistency of production should be taken into consideration by the buyer as well as unit price.

For more planning guidance, review the differences between an OEM and ODM battery manufacturer and the typical factors affecting custom battery MOQ, cost and lead time.

Frequently Asked Questions

Who is the best custom battery manufacturer?

There is no universal best manufacturer. GLOFLUX suits flexible OEM/ODM development, Grepow specializes in high-rate and shaped batteries, while Inventus Power is positioned for complex global OEM programs.

Can a manufacturer customize the BMS?

Yes. A qualified supplier can customize protection thresholds, balancing, fuel gauging and communication functions such as SMBus, I²C, CAN bus or RS485.

What certifications do custom lithium batteries need?

Requirements depend on the application and destination market. UN38.3 is commonly required for lithium battery transportation, while IEC, UL, CE and industry-specific standards may also apply.

What is the typical MOQ for a custom battery pack?

MOQ varies according to cell availability, tooling, enclosure requirements and manufacturing process. A modified standard pack usually has a lower entry quantity than a completely new cell or molded enclosure.

What should be tested before mass production?

Prototype validation should cover capacity, current output, charging, temperature, protection behavior, mechanical fit and operation inside the finished device.