Custom Battery Packs
for Industrial OEMs.
TSJ Battery designs and assembles NiCd, NiMH, LiFePO4 and Li-ion battery packs for emergency lighting, personal care, tools and industrial equipment.
- Custom voltage, capacity, size and connectors.
- Pack design and assembly support.
- UN38.3, MSDS, CE and RoHS documents available.
For OEM/ODM projects with clear battery requirements.
Reliable Manufacturing & Quality Control
20+ years in cylindrical cells and packs with high standards production lines, strict IQC/OQC and full traceability for industrial projects.
Flexible Custom Cells & Packs
Support custom sizes, voltage, capacity, tabs and BMS. Sample lead time typically around 7-15 days to fit your design and testing schedule.
Global Certifications & Safe Transport
UN38.3, MSDS, CE, RoHS and shipping reports available to support EU, US and Asia imports for emergency lighting, tools and ESS projects.
Who We Typically Work With
We exclusively serve B2B clients requiring high-reliability power solutions. Our production lines are optimized for enterprise volume and stringent QC standards.
Emergency Lighting Manufacturers & Service Agents
Exit signs, luminaires & backup systems
High-temperature tolerant cells designed for continuous trickle charge and rapid discharge during critical outages.
OEM/ODM Product Brands
Personal care, smart appliances & electronics
White-label manufacturing with custom PCB/BMS design to fit exact housing dimensions and power requirements.
Battery Importers & Distributors
Wholesale supply & localized distribution
Reliable bulk supply chains with comprehensive UN38.3/MSDS documentation for seamless global logistics.
Industrial Equipment Companies
Medical, power tools, robotics & high-drain
High-drain, shock-resistant battery packs engineered for heavy vibrations and extreme operating environments.
Tailored Battery Solutions for Your Specific Industry Needs
As a dedicated custom battery manufacturer, TSJ Sanjun doesn’t just sell cells. We solve the unique power challenges of medium-sized OEM/ODM brands with our comprehensive range of NiCd, NiMH, LiFePO4, and Li-ion (NCM) battery solutions, backed by 15 years of engineering expertise.
Emergency Lighting & Security
In the emergency lighting sector, reliability under extreme conditions is non-negotiable. Whether you are navigating the transition from NiCd to LiFePO4 or seeking compliant high-temperature solutions, TSJ Sanjun is your trusted partner.
Our high-temperature NiCd battery and LiFePO4 battery packs are engineered to meet strict EU 2023/1542 regulations. We ensure your exit signs and emergency luminaires remain functional even in environments reaching 70°C.
- Compliance: Fully meets ICEL 1010, UL924, and IEC 61951 standards.
- Thermal Stability: Stable discharge performance in high-heat ceiling environments.
- Durability: 4-year+ service life for critical safety infrastructure.
Personal Care & Small Appliances
For personal care devices like electric shavers, hair clippers, and toothbrushes, the biggest challenge is the "Perfect Fit" and long-lasting power. Even a 0.5mm deviation can cause assembly failure in compact housings.
We specialize in high-energy-density Li-ion (NMC/NCM) batteries (such as 14500, 18650, and 10440) with zero-tolerance size consistency. Our custom Li-ion battery packs include integrated smart BMS for precise overcharge and overheat protection, ensuring absolute consumer safety.
- High Energy Density: Maximum runtime for compact wireless devices.
- Size Precision: Consistent lot-to-lot dimensions for seamless mechanical assembly.
- Safety First: Multi-layer BMS protection specifically designed for Li-ion batteries.
NCM Cylindrical Cells for Compact High-Drain Battery Packs
Compact power tools, handheld equipment, and small motor-driven devices often require cells that can support short bursts of high current without rapid voltage drop.
TSJ Sanjun does not position itself as a dedicated power tool battery pack manufacturer. Instead, we supply high-rate cylindrical NCM cells that can be used by OEM pack builders for compact battery pack designs requiring around 5C-10C discharge performance.
Our focus is stable cell performance, consistent internal resistance, and reliable batch matching for customers who already design or assemble their own battery packs.
- High-Rate Cell Option: NCM cylindrical cells available for compact pack designs requiring around 5C-10C discharge performance.
- Consistent Cell Matching: Internal resistance and voltage sorting help pack builders improve output stability.
- For OEM Pack Builders: Suitable for customers who manage their own BMS, welding, housing, and pack assembly process.
Solar Lighting & Energy Storage (ESS)
Small-to-medium scale energy storage requires a balance of cost-efficiency and cycle life. From solar street lights to UPS backup systems, the battery manufacturer must guarantee long-term stability.
Our LiFePO4 battery packs offer typical cycle life of 2000–6000 cycles, making them the ideal long-term investment for solar applications. We provide scalable designs that are easy to integrate into existing outdoor or indoor storage enclosures.
- Long Cycle Life: Drastically reduces maintenance and replacement costs.
- Eco-Friendly: 100% RoHS and REACH compliant, zero heavy metal pollution.
- Weatherproof Designs: Reliable operation in both extreme cold and tropical heat.
Real Application Proof: Our custom battery solutions are currently powering thousands of emergency exit systems in the European Union and backup power infrastructures in the Middle East.
Engineering Excellence in Every Cell
At TSJ Sanjun, we believe that a custom battery pack is only as strong as its weakest cell. That is why our manufacturing process emphasizes rigorous cell consistency screening. We strictly match cylindrical battery cells based on internal resistance, voltage, and capacity tolerances before any assembly begins.
Beyond high-quality raw cells, our in-house engineering team specializes in intelligent BMS (Battery Management System) co-development. Whether you need a high-temperature NiCd battery for emergency lighting or a high-discharge Li-ion (NMC/NCM) battery for power tools, we design the protection circuitry to match your device's exact power profile and safety requirements. Explore our core battery chemistries below to find the perfect foundation for your next project.
NiCd
High-temperature AAA, AA, SC, C, D and F Ni-Cd cells and battery packs, widely used in emergency lighting and safety systems.
- High temperature tolerance
- Long shelf life
- Robust performance
NiMH
Environment-friendly NiMH cells for medical devices, personal care products and consumer electronics, with low self-discharge options.
- High energy density
- Environmentally friendly
- No memory effect
LiFePO4
14500, 18650, 26650, 32700, 32140 LiFePO4 cells for emergency lighting, backup power, ESS and lead-acid replacement with long cycle life and high safety.
- Exceptional safety profile
- Typical cycle life of 2000–6000 cycles
- Thermal stability
Li-ion NCM
10440, 14500, 18650, 21700, 26650 cells with 3.7V nominal voltage and 2200–2600mAh capacity, ideal for DC fans, small appliances and handheld tools.
- Maximum energy density
- Compact form factor
- High discharge rates
Advanced Manufacturing & Uncompromising Quality Control
With dual production bases in Jiangmen and Anhui, TSJ Sanjun combines 15 years of battery manufacturing expertise with agile, semi-automated production systems. We guarantee industrial-grade consistency while offering the ultimate flexibility to handle complex custom designs that rigid automated giants cannot accommodate.
TSJ Battery factory overview: cylindrical cell production, custom pack assembly, and QC testing.
1. Custom Engineering & Fast Prototyping
We don't just build batteries; we co-develop solutions. Our engineering team designs bespoke BMS (Battery Management Systems) and optimizes mechanical layouts, delivering functional custom battery pack prototypes within 7 to 15 days.
2. Precision Cell Matching & Flexible Assembly
Consistency is everything. We utilize advanced testing instruments for strict internal resistance and voltage sorting. From there, our highly skilled technicians utilize flexible assembly lines to construct complex battery geometries and delicate wiring layouts with artisan-level precision.
3. 100% QC Testing & Global Export Ready
Every batch undergoes rigorous cycle-life and extreme-temperature testing in our in-house lab. Fully backed by UN38.3, CE, and RoHS certifications, your batteries are ready for safe, hassle-free global shipping.
Certified for Global Safety & Seamless Customs Clearance.
Frequently Asked Questions About Our Battery Solutions
Expert insights to help you make informed decisions for your OEM/ODM battery projects.
Still have questions? → Talk to our engineersWhile industry giants focus on massive, multi-million unit orders, they often lack the flexibility and responsiveness required by medium-sized brands. TSJ Sanjun operates as a boutique custom battery manufacturer where every mid-scale project is a VIP priority. We provide direct access to our battery engineering team, no corporate bureaucracy, and flexible MOQs that giants simply won't accommodate. Partnering with us means you get source-factory pricing combined with the agile support and dedicated attention your project deserves to reach the market faster.
Navigating the EU Battery Regulation 2023/1542 is a core expertise at TSJ Sanjun. We specifically engineer our NiCd battery solutions to meet the strict industrial and emergency lighting exemptions. Simultaneously, we assist clients in transitioning to high-performance LiFePO4 battery packs that maintain necessary thermal stability at 70°C. Every battery pack we ship is backed by a comprehensive compliance folder, including UN38.3, MSDS, CE, and RoHS, ensuring your products face zero legal hurdles in European or North American markets.
Precision is our hallmark. For personal care and medical device manufacturers, a 1.0mm tolerance can be the difference between a successful assembly and a failure. Our specialized facility produces Li-ion (NMC/NCM) battery cells (such as 14500, 18650, and 10440) with industry-leading size consistency. We don't just supply cells; we design the entire custom Li-ion battery pack, including a bespoke BMS (Battery Management System) tailored to your device's exact power curves and space constraints.
Agility is one of our greatest competitive advantages. For standard cylindrical battery configurations, we typically provide physical samples within 7 days. For more complex custom battery pack projects that require specialized BMS design or unique enclosure configurations, our engineering team usually delivers a functional prototype within 15 days. This rapid turnaround allows our clients to complete their product validation and move into mass production months ahead of their competitors who are stuck in large-factory queues.
Ready to Upgrade Your Battery Supply Chain?
You should schedule a quick project discussion with our engineering team today if:
Your current supplier struggles with cell size consistency, poor capacity matching, or delayed deliveries.
You need strict UN38.3, UL, CB, CE, MSDS, or EU 2023/1542 compliant battery packs for seamless global export.
You are developing new emergency lighting, personal care, or high-drain industrial devices that require custom BMS design.
You are tired of "big factory" bureaucracy and need a reliable manufacturing partner who treats your mid-sized project as a VIP priority.
Start Your
Custom Battery Project.
Our engineering team is ready to review your specifications and provide a technical feasibility report.
24-Hour Response
Our technical sales team responds to all inquiries within 24 hours with detailed information.
Detailed Documentation
Receive comprehensive datasheets, specifications, and technical drawings for your project.
Expert Consultation
Work directly with our experienced engineers to optimize your project requirements.
Secure & Confidential
Your project information is protected with enterprise-grade security.
ISO Certified
Quality management systems certified to international standards.
Expert Support
Direct access to our engineering team for technical consultation.