What LB. Engineering Japan does

LB. Engineering Japan (株式会社 L-B. Engineering Japan), founded March 2018 and headquartered in Yokohama, develops, manufactures, and sells lithium-ion battery storage systems built from end-of-life (EV卒) electric-vehicle batteries, primarily sourced from Nissan LEAF units. The company applies a proprietary LBEJ Authentication System that standardizes the full repurposing process — battery collection, disassembly, module evaluation, grading, and reassembly — together with a battery management system (BMS) that performs high-precision cell balancing on used cells that retain approximately 50–67% of original capacity. Its product portfolio spans portable batteries (D1), carrier-mounted mobile batteries (E2), high-capacity portable emergency units (D4), stationary storage (E6), emergency-battery-equipped solar street lights (S3), portable digital signage with battery (S6), and an L8/L4 hybrid battery system (2.1–12.6kWh) launched in 2025, plus application-specific replacements for golf carts, turret vehicles, and kitchen cars. The technology base rests on lithium-ion manganese spinel cells and multi-layered safety design (3x/4x redundancy against overcharge, over-discharge, and over-temperature), with Four-Round's UL1974 certification (world's first for a reused EV battery) underpinning third-party safety validation.

The business operates a hybrid revenue model: one-time product sales via direct website inquiry, a rental desk for events, BCP, surveillance, and outdoor use, application-specific battery-replacement sales (lead-acid to lithium), and a growing licensing/certification revenue stream from the LBEJ Authentication System introduced in 2025. Pricing is quote-based rather than publicly listed. Go-to-market is product-led and direct: the company sells through its own website, contact forms, and rental applications, supplemented by earned-media coverage (Nikkei, Nissan Global Stories, Nissan Technical Review) and community partnerships (Yokohama F. Marinos, Tokyo University of Science soccer club). Customer segments are three primary verticals — municipalities and local governments (disaster preparedness, BCP, public-facility lighting), large manufacturers led by Nissan (factory perimeter lighting, ESG, EV battery lifecycle), and SMBs/individuals (events, construction, surveillance) — with secondary use cases in healthcare backup (vaccine cold storage) and industrial fleet electrification (golf carts, turret vehicles, kitchen cars). Reported FY2023 revenue of 260 million JPY (highest to date) with a 5 million JPY net profit, 400+ S3 solar street light installations nationwide by January 2026, and a February 2024 capital increase to 9 million JPY registered capital indicate an early-stage but scaling commercial operation concentrated entirely in the Japanese market.

Name

LB. Engineering Japan

Legal name

株式会社 L-B. Engineering Japan

Website

https://lb-engineering.co.jp

Company type

Private

Founded year

2018

Operating status

Operating

Short description

LB. Engineering Japan repurposes end-of-life EV lithium-ion batteries (mainly Nissan LEAF) into portable, stationary, and solar street-light battery systems, selling and renting them to Japanese municipalities, manufacturers, and SMBs.

Ownership category

akta.pro rank

Product category

Energy Storage Systems (Battery)

NAICS

Battery Manufacturing (335910)

SIC

Electronic & Other Electrical Equipment (No Computer Equip) (3600)

akta.pro primary industry

Battery Modules & Packs (Industrial/Commercial pack assembly) (IMAGAHAB)

akta.pro secondary industries

Battery Management Systems (BMS) & Pack Electronics Manufacturing (EUAFABAJ), Compliance, EPR & Battery Passport Services (Regulatory Reporting, Traceability, Audits) (EUAFACAJ), Batteries & Battery Packs (Rechargeable/Primary, Device-Specific Packs) (CRACATAG)

Keywords

• Lithium-ion battery storage
• Repurposed EV batteries
• Portable power stations
• Solar street lighting
• Battery repurposing systems

Headquarters

HQ city

Yokohama

HQ country

Japan

HQ region

Asia

Offices2 records

Markets served

GTM type

B2B and B2C

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Battery System Products Sales: Sale of various lithium-ion battery storage systems (D1, E2, D4, E6, S3, S6 Series) directly to customers. Products are sold as one-time purchases with pricing based on capacity and specifications. The company also began net sales in 2022.
2. Rental Services: Rental of portable and mobile battery systems for events, disaster preparedness, outdoor use, BCP, and surveillance cameras. Rental is priced per unit per period, with a defined rental flow from application to return. Pre-payment required.
3. LBEJ Authentication / Certification System: The company licenses its proprietary EV battery repurposing process and standards to partner companies, allowing them to manufacture certified repurpose products using the LBEJ framework. Revenue from process licensing and certification fees.
4. Parts Replacement (Lead Battery to Lithium): Replacement of conventional lead-acid batteries in golf carts, turret vehicles, and kitchen cars with repurposed lithium-ion batteries. Sold as product upgrades and replacements.

Pricing tiers

Go-to-market motion1 record

Distribution channels3 records

Marketing channels5 records

Core offering

LB. Engineering Japan develops, manufactures, and sells lithium-ion battery storage systems built from repurposed end-of-life EV (electric vehicle) batteries, primarily Nissan LEAF cells. Its product portfolio includes portable batteries (D1, E2, D4), stationary storage (E6), solar street lights (S3), portable digital signage (S6), and hybrid battery systems (L4/L8, E7), sold directly and rented to municipalities, enterprises, SMBs, and individuals in Japan.

Product overview

LB. Engineering Japan is a company specializing in lithium-ion battery system development, manufacturing, and sales, with a focus on repurposing EV (electric vehicle) batteries. The company offers a portfolio of portable, mobile, and stationary battery products including: D1 Series (portable battery), E2 Series (carrier-mounted mobile battery), D4 Series (portable emergency battery), E6 Series (stationary large battery system), S3 Series (solar street light), S6 Series (portable digital signage with emergency battery), L8/L4 Hybrid Battery System (2.1-12.6kWh variable capacity), and E7 Storage-type Hybrid Battery System. The products are built using regenerated Nissan LEAF batteries and are designed for applications including disaster emergency response, BCP measures, outdoor activities, industrial equipment, and solar-powered infrastructure. The company also provides application-specific solutions for golf carts, turrets, and kitchen vehicles. Rental services are available for all battery products.

Differentiator

Problem solved

Functional benefit

Quantifiable outcome

• Zero battery incidents across Nissan LEAF global fleet (~700,000 units) — the company maintains this standard for all its repurposed battery products.
• +4 more outcomes

Named customers12 records

Segments4 records

Ideal customer profiles4 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature5 records

Partnerships

Three partnerships are on record, tiered minor and core.

• 東京科学大学サッカー部 (Tokyo University of Science Soccer Club)minorGTM or Marketing Partner · 8 July 2025LB. Engineering Japan entered a partnership agreement with the Tokyo University of Science soccer club in July 2025 to support young athletes. The partnership includes plans for industry-academia collaboration (産学連携) to expand the reuse battery business. The company supports future generations through this initiative.
• 横浜F・マリノス (Yokohama F. Marinos)minorGTM or Marketing Partner · 14 March 2025LB. Engineering Japan signed a sponsorship contract with Yokohama F. Marinos in March 2025, providing brand visibility and community engagement in the Yokohama area where the company operates its development center.
• フォーアール (Four-Round Co., Ltd.)coreTechnology or Integration · 31 August 2019Four-Round's lithium-ion battery was the world's first reused EV battery to obtain UL1974 certification. LB. Engineering Japan uses Four-Round's batteries as the core component of its repurposed battery systems, enabling third-party safety verification and market credibility for its products.

Scale indicators5 records

Recent moves7 records

Expansion highlights6 records

Direct peers

• NExT-e Solutions: Japanese second-life battery company working on used Nissan LEAF and EV battery reuse for industrial/grid applications. Closest Japanese regional peer to LBEJ with overlapping technology but different commercial focus.
• B2U Storage Solutions: US-based company building grid-scale energy storage systems from retired Nissan LEAF and other EV batteries. Direct comparable on technology (second-life packs, BMS-led safety architecture) and on similar power-grid commercial power-free product framing.
• Connected Energy: UK-based specialist in second-life EV battery energy storage systems (E-STOR) for commercial and grid use. Closest direct peer to LBEJ in repurposing end-of-life EV packs into stationary storage products.
• 4R Energy (Four-Round / フォーアールエナジー): Joint venture between Nissan and Sumitomo Corporation focused on repurposing end-of-life Nissan LEAF batteries for stationary and second-life applications. Most direct comparable because both target the same Nissan LEAF feedstock and hold UL1974-type safety certifications used by LBEJ products.

Emerging players

• Smartville: US startup that repurposes retired EV batteries (notably from school buses and passenger EVs) into stationary storage. Comparable as a focused second-life OEM with proprietary grading and safety IP, at an earlier stage than LBEJ but addressing the same product category.
• Elektros (Elektros Mobility / SunGreen): US-based EV battery repurposing company (formerly SunGreen Systems) targeting second-life and solar storage. Comparable as a smaller, emerging second-life battery OEM active in the same market category.

Broad incumbents

• EnerDel / EnerSys (industrial lithium replacement): Industrial battery OEM with deep experience replacing lead-acid forklift, golf, and specialty vehicle batteries with lithium. Overlaps with LBEJ's golf-cart and turret battery replacement product line as a much larger incumbent competitor.
• GS Yuasa (industrial / stationary battery): Major Japanese battery manufacturer with stationary storage and lithium product lines serving BCP / disaster-preparedness applications. Comparable broad-incumbent peer competing for the same Japanese BCP and stationary-storage budgets as LBEJ.
• Sumitomo Metal Mining / Sumitomo Corp. (Nissan LEAF reuse program): Sumitomo and partners operate second-life battery storage projects in Japan (e.g., Namie megabatte storage). Comparable as a diversified industrial incumbent deploying repurposed Nissan batteries at scale, with broader energy/commodity capabilities than LBEJ.
• Renault Re-Factory / The Future Is Neutral: Renault's entity dedicated to EV battery second-life, recycling and circular economy. Directly comparable because it is also a vehicle-OEM-affiliated second-life repurposing business, with broader European scale and capital.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

Compliance3 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Funding overview

Funding rounds

Investors

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 LB. Engineering Japan