Custom Power

What Custom Power does

Custom Power is a US-founded designer and manufacturer of customized battery packs and energy solutions for mission-critical and safety-sensitive applications, established in 1965 and headquartered in Fountain Valley, California with a UK operational base in Crewkerne, Somerset. Since August 2022 it has operated as the Power division of Solid State plc (London Stock Exchange: SOLI), acquired for up to $45 million to combine Custom Power's battery pack expertise with Solid State's broader power electronics capabilities. The company serves seven primary verticals: Aerospace & Defense, Robotics & Automation, Unmanned Systems & Drones, Medical, Industrial, Energy, and Oceanographic, with named exposure to US Tier 1 defense and security customers in air and maritime domains, UK medical device manufacturers, industrial equipment makers, energy sector customers, and US autonomous vehicle companies.

The core technology is custom battery pack assembly using multiple chemistries (Lithium Ion, Lithium Polymer, LiFePO4, Ni-MH, Ni-Cad, SLA, primary lithium) sourced from tier-1 cell suppliers including Energizer, LG Chem, Panasonic, Saft, Samsung SDI, and GP Batteries. Differentiated capabilities include proprietary APTIX series battery packs (including APTIX-One), high-temperature and ATEX-certified hazardous-location packs, integrated battery management systems with CAN bus/SMBus/I2C communication, and full-service support covering design, design-for-manufacture, custom build, testing/verification/qualification, and lithium battery transportation compliance. The company holds ISO 9001 certification, ITAR registration for handling US defense articles, and RBRC membership.

The business model is a quote-based, consultative B2B direct sales motion with a structured enterprise organization (Managing Director/Global VP & GM and a US-dedicated Chief Sales Officer). Revenue streams include custom battery pack sales, standard battery pack products, build-to-print manufacturing, and non-recurring engineering fees for new designs. Pricing is not publicly disclosed; minimum order values are $200 for standard products and $1,000 for custom assembly, with a 12-month warranty. All sales flow through direct enterprise engagement with no e-commerce or retail channels, and the company exhibits customer reliance on engineering-led specification processes requiring detailed project parameters from prospects.

Name

Custom Power

Legal name

Custom Power

Website

https://custompower.com

Company type

Private

Founded year

1965

Operating status

Operating

Headcount range

51–100 employees

Short description

Custom Power designs and manufactures custom battery packs for mission-critical applications in aerospace & defense, medical, robotics, drones, industrial, energy, and oceanographic markets; operates as the Power division of Solid State plc from facilities in Fountain Valley, CA and Crewkerne, UK.

Ownership category

akta.pro rank

Product category

Custom Battery Packs & Energy Solutions

NAICS

Battery Manufacturing (33591), Battery Manufacturing (335910)

akta.pro primary industry

Battery Pack Manufacturing & Module Assembly (EUAFABAI)

akta.pro secondary industry

Battery Management Systems (BMS) & Pack Electronics Manufacturing (EUAFABAJ)

Keywords

• Custom battery packs
• Mission-critical power solutions
• Harsh-environment batteries
• ATEX-certified batteries
• Battery management systems

Headquarters

HQ city

Fountain Valley

HQ country

United States

HQ region

North America

Offices2 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Supply Chain, Personnel, Operations, Technology or R&D, Marketing or Sales, Infrastructure

Revenue model

1. Custom Battery Pack Sales: Design and manufacture of bespoke battery packs for mission-critical applications. Revenue generated from custom-engineered solutions with NRE (non-recurring engineering) fees for new designs, plus production costs. Custom assembly minimum order value is $1,000.
2. Standard Battery Pack Products: Sale of standard battery pack products including APTIX series, high-temperature packs, ATEX batteries, and battery chargers. Minimum factory order is $200.
3. Build to Print Battery Packs: Manufacturing of customer-specified battery pack designs with minimum custom assembly value of $1,000
4. Non-Recurring Engineering (NRE) Fees: Engineering fees charged for new custom battery pack designs, including drawing creation, first article approval, and qualification testing

Pricing tiers

Go-to-market motion2 records

Distribution channels1 record

Marketing channels5 records

Core offering

Custom Power designs and manufactures custom-engineered battery packs and energy solutions for mission-critical and harsh-environment applications across multiple chemistries. The company supplies custom, standard, and build-to-print battery packs, the proprietary APTIX series, ATEX-certified and high-temperature batteries, integrated battery management systems, and battery chargers, supported by design, testing, and compliant lithium battery transportation services.

Product overview

Custom Power is a custom battery pack manufacturer and energy solutions provider offering a comprehensive portfolio of products and services. The core product lineup includes Custom Battery Packs (tailored for harsh environments), Standard Battery Packs (pre-configured options), and Build to Print Battery Packs (customer-specification driven). The APTIX Series represents a branded product line including APTIX-One. Specialty offerings include High Temperature Battery Packs for thermal-challenging applications and ATEX Batteries for hazardous environments. Supporting products include Battery Management Systems and Battery Chargers (including Mascot Chargers). The company provides complementary services spanning Design & Development, Design for Manufacture, Custom Built Battery Packs, Testing/Verification/Qualification, Support, and Lithium Battery Transportation. The portfolio serves demanding markets including Aerospace & Defense, Robotics & Automation, Unmanned Systems & Drones, Medical, Industrial, Energy, and Oceanographic sectors. Custom Power operates as the Power division of Solid State plc, with US operations in Fountain Valley, CA and UK operations in Crewkerne, Somerset.

Differentiator

Problem solved

Functional benefit

Brands

• APTIX Series Battery Packs: A product line of custom battery packs offered by Custom Power.
• APTIX-One

Products and services

• Custom Battery Packs Specially designed battery packs engineered to provide optimal performance in harsh environments, tailored to customer-specific requirements for mission-critical applications such as defense, aerospace, medical, robotics, drones, industrial, energy, and oceanographic use.
• Standard Battery Packs Pre-configured battery packs available for common applications, offering reliable power solutions for industrial and commercial use without the engineering engagement of a fully custom pack.
• Build to Print Battery Packs Battery packs manufactured to customer-supplied designs, blueprints, and specifications, ensuring precise adherence to customer design requirements and enabling OEMs to outsource assembly while retaining design ownership.
• APTIX Series Battery Packs A proprietary product line of specialized battery packs within the APTIX brand, designed for specific application requirements in demanding environments.
• APTIX-One A specific product within the APTIX Series, engineered for targeted power solutions in specialized applications.
• High Temperature Battery Packs Battery packs designed to operate reliably in elevated temperature environments, suitable for industrial and aerospace applications with thermal challenges.
• ATEX Batteries Batteries certified for use in potentially explosive atmospheres in accordance with ATEX directives, designed for hazardous-location applications in oil & gas, mining, and chemical industries.
• Battery Management System (BMS) Electronic systems that monitor, manage, and protect battery packs, integrating protection circuits, fuel gauges, thermistors, fuses, and communication protocols (CAN bus, SMBus, I2C) to ensure optimal performance, safety, and longevity of battery installations.
• Battery Chargers Charging solutions including Mascot Chargers for reliable and efficient battery charging across various battery chemistries and applications.
• Design & Development Services Engineering services for custom battery design, including application analysis, chemistry selection, and performance optimization for harsh environments.
• Design for Manufacture Services Services ensuring battery pack designs are optimized for efficient and cost-effective manufacturing processes.
• Custom Built Battery Packs Assembly Service Precision assembly of custom battery packs developed to provide reliable power for mission-critical applications.
• Testing, Verification & Qualification Services Comprehensive testing and validation services to ensure battery packs meet industry standards and application-specific requirements.
• Lithium Battery Transportation Services Specialized logistics services for safe transportation of lithium batteries in compliance with international regulations including IATA, IMDG, and ADR.

Named customers6 records

Segments7 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature4 records

Partnerships

Two partnerships are on record, tiered core.

• VolkleccoreStrategic or Co-development Partner · 2 September 2025Custom Power's UK company has partnered with Volklec, the UK's only independent battery manufacturer, to deliver sovereign, end-to-end energy solutions for the UK defense sector. This partnership combines Custom Power's battery pack expertise with Volklec's cell manufacturing capabilities.
• Solid State plccoreOthers · 8 August 2022Custom Power LLC was acquired by Solid State plc in August 2022. Custom Power operates as the Power division of Solid State plc, combining battery design capabilities with the broader group's power electronics expertise. Dave Crossman serves as Managing Director and is an appointed member of the Solid State plc Executive Board.

Scale indicators4 records

Recent moves8 records

Expansion highlights5 records

Emerging players

• Volklec: UK's only independent battery cell manufacturer and strategic partner of Custom Power. Adjacent in the UK defense battery ecosystem, sharing the sovereign UK defense supply-chain theme; differs by being a cell maker rather than pack assembler.

Regional players

• Epsilor Electric Fuel: Israel-based developer and manufacturer of military and commercial batteries and chargers. Comparable defense-focused custom pack portfolio, but primarily serves Israeli and European defense customers with limited direct overlap in the US/UK.

Direct peers

• Denchi Group: UK-based designer and manufacturer of high-performance batteries for defense and security applications. Comparable in custom lithium battery packs for UK and European defense markets, with similar mission-critical specialization and customer profile.
• Bren-Tronics: US-based designer and manufacturer of rechargeable and primary battery packs for military and commercial applications. Highly comparable to Custom Power: shares the defense-first customer base, custom-engineered pack approach, and mission-critical/harsh-environment specialization.
• EaglePicher Technologies: Manufacturer of batteries and battery systems for defense, aerospace, and medical markets. Comparable to Custom Power in mission-critical defense/medical battery packs, ITAR-registered operations, and long-cycle qualification programs.
• Inventus Power: Designer and manufacturer of custom battery packs, chargers, and power solutions for medical, industrial, and military markets. Directly comparable product portfolio (custom Li-ion packs, BMS integration) and a similar multi-chemistry, multi-vertical go-to-market.
• Ultralife Corporation: US-listed provider of batteries and communications systems for defense, medical, and industrial customers. Comparable in defense and medical battery packs, custom-engineered power solutions, and exposure to rugged/military-grade applications.
• A123 Systems: Developer and manufacturer of advanced lithium-ion battery cells, modules, and packs for transportation, grid, and commercial markets. Comparable in custom Li-ion pack assembly for demanding applications, including defense-adjacent programs.

Broad incumbents

• EnerSys: Global industrial battery manufacturer with a defense and specialty battery division. Comparable in serving defense and industrial power customers, but with a much broader portfolio (large-format lead-acid, lithium, motive power) that makes it an incumbent rather than a niche peer.
• Saft (TotalEnergies): Specialty battery manufacturer (part of TotalEnergies) serving defense, aerospace, and industrial customers. Overlaps with Custom Power on mission-critical and harsh-environment packs but operates as a much larger, broader incumbent; also a current cell supplier to Custom Power.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat5 records

Key risks5 records

Key highlights6 records

Customer concentration

Compliance2 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles3 records

Funding overview

Funding rounds2 records

Investors2 records

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Custom Power