Lithotop Logo 3
Inquire Now

Custom Lithium-ion Battery Pack Manufacturer for OEM Devices

LithoTop designs and manufactures custom lithium ion battery packs using 14500, 16340, 18500, 18650, 21700, 26650 and other cylindrical Li-ion cells. From cell selection and series-parallel configuration to custom BMS, wires, connectors and enclosure integration, we provide complete OEM lithium ion battery pack solutions for professional electronic products.

Stop worrying about thermal runaway or sudden power drops in the field. We audit every Custom Lithium-ion Battery through 48-hour stress testing to protect your medical and robotics reputation and ensure 100% field uptime.

✅ 100% BMS Stress Testing | Verified under extreme loads.

✅ Delta V under 5mV | Stops early pack failure.

✅ True UN38.3 Compliance | Zero customs delay guarantee.

Get A Factory Quote(Response in 12h)
View Our Work

Custom Cylindrical Lithium-ion Battery Pack Solutions

No MOQ for standard cells. We provide factory-direct cylindrical packs with specialized engineering to support your rapid prototyping and R&D.

7.4V 10.4Ah

18650 Battery Pack

Proven industrial standard for reliable power and cost-effective mass production.

21.6V 15000mAh Samaung 3

21700 Battery Pack

High energy density cells providing extended runtime for robotics and automation.

14500 3.7v 800mah battery

14500 Battery Pack

Standard AA-size power solutions ideal for portable medical and handheld devices.

5000mah Li-ion Battery 26650

26650 Battery Pack

High-capacity cylindrical solutions built for heavy-duty industrial and power tools.

LiFePO4 32700 3.2V 6000mAh Rechargeable

18500 Battery Pack

Mid-size cylindrical cells offering an ideal balance of energy density and portability.

10220 130mah 3.7v battery

Other Li-ion Battery

Versatile cylindrical cell options to meet general industrial and consumer needs.

3.7v 800mah rechargeable battery

16340 Battery Pack

Compact CR123A-size cells for smart sensors and handheld devices.

2 scaled

USB Li-ion Battery

Integrated USB port for convenient, cable-free consumer power.

Proven Custom Battery Projects

We turn complex power needs into safe and working hardware. Look at our real builds to see how we protect projects from failure with smart engineering.

CE Li-ion Battery Pack 14500 800mAh
CE Li-ion Battery Pack 14500 800mAh
16650 2000mAh Torch Light Lithium Battery
16650 2000mAh Torch Light Lithium Battery
16340 800mAh battery
16340 800mAh battery
130mah 3.7v rechargeable battery
10220 130mah rechargeable battery
18650 7P
Li-ion 18650 Battery 7.4V 10.4Ah
Li-ion 18650 Battery 7.4V 10.4Ah
LG21700-3S1P 11.1V 5800mAh
LG21700-3S1P 11.1V 5800mAh
21700-8S4P 28.8V 20000mAh
21700-8S4P 28.8V 20000mAh
Li-ion 15000mAh 6S3P
21.6V-15000mAh (Samaung)
21.6V-10000mAh
21.6V-10000mAh (Samaung)
18650 3000mAh
18650 3000mAh
Start My Project

Which Cylindrical Li-ion Cell Fits Your Product?

Battery diameter, length, capacity, current capability and cell availability should all be considered before selecting the final cylindrical lithium-ion cell.

Cell FormatApproximate SizePositioningRecommended Applications
1018010 × 18mm classUltra-miniatureMini sensors, wearable electronics and compact IoT devices
1022010 × 22mm classUltra-small cylindricalMicro electronics, tracking devices and miniature sensors
1028010 × 28mm classSlim miniatureWearables, IoT sensors and compact electronic devices
1040010 × 40mm classSlim cylindricalPen-style devices, sensors and narrow electronics
1084010 × 84mm classLong & narrowSlim instruments, tubular devices and specialized OEM electronics
1087010 × 87mm classLong cylindricalLong narrow equipment, portable instruments and OEM products
1420014 × 20mm classShort & compactCompact sensors, security devices and miniature electronics
1425014 × 25mm classCompact cylindricalIoT sensors, tracking devices and portable electronics
1428014 × 28mm classCompact cylindricalSmart devices, wireless sensors and security products
1443014 × 43mm classSlim mid-lengthPortable electronics, instruments and compact OEM devices
1450014 × 50mm classCompact cylindricalHandheld, tubular and space-limited devices
1465014 × 65mm classLonger slim formatPortable instruments, smart devices and narrow battery packs
1527015 × 27mm classShort compact formatSensors, security electronics and compact wireless devices
1628016 × 28mm classCompact cylindricalIoT devices, sensors and compact consumer electronics
1631016 × 31mm classShort cylindricalSecurity equipment, sensors and portable electronics
1634016 × 34mm classShort & compactSensors, security devices and lighting equipment
1650016 × 50mm classMid-size cylindricalPortable electronics, instruments and OEM battery packs
1665016 × 65mm classSlim high-energy formatPortable equipment, industrial electronics and battery packs
1835018 × 35mm classShort 18mm platformCompact lighting, instruments and portable devices
1850018 × 50mm classMid-sizePortable electronics, instrumentation and OEM equipment
1865018 × 65mm classBalanced platformMedical, IoT, robotics and industrial equipment
2170021 × 70mm classHigher energyRobotics, power tools, mobility and industrial devices
2665026 × 65mm classLarge cylindricalHigh-capacity OEM equipment, industrial systems and power applications
Not sure Which cell? Talk to an engineer

Custom Lithium-ion Battery Manufacturing Specifications

Stop guessing your battery specs. We provide full technical data from cell chemistry to housing limits to help you pick the right solution and avoid project failure.

Cell Formats and Geometric Adaptability

Core FormatDimensions & SizingBest ApplicationIndustrial Tips
Cylindrical Cells18650, 21700, 32700, 46800Portable Medical, Power Tools, E-mobility Mechanical cell holders are essential for vibration-prone devices. This prevents internal shorts caused by adhesive fatigue during long-term field operations.
Prismatic CellsCapacity: 50Ah to 300Ah+AGVs, Forklifts, Solar ESS, Robotics Thermal expansion is a critical factor. Enclosures are engineered with 3mm-5mm expansion gaps and compression plates to eliminate the risk of casing cracks during high-load charging cycles.

Choosing the Right Energy Core

High-Density NMC

  • Nominal Voltage: 3.6V - 3.7V
  • Energy Density: 200 - 260 Wh/kg
  • Cycle Life: 500 - 800 Times

Industrial Standards: Ideal for lightweight portability. Integration of active NTC monitoring and thermal cut-off logic prevents cell degradation over 60°C.

High-Rate Discharge

  • C-Rating: 10C Continuous / 50C+ Burst
  • Internal Resistance: Low Variance
  • Response: Sub-millisecond Power Delivery

Industrial Standards: Pure copper busbars are utilized to handle high-current stress. Standard nickel strips are avoided to prevent melting under extreme burst loads.

B2B Production Certainty Checklist

Potential field failures are intercepted through these three manufacturing anchors prior to shipment:

1. Protocol Handshake

Verification of CANBus, RS232, RS485, Bluetooth, and other communication protocols ensures a perfect technical handshake with the target hardware.

2. Cell Consistency Audit

Every cell is matched by voltage and internal resistance (IR) within 1% tolerance to maximize the overall pack lifespan.

3. Environmental Stressing

Electrolyte and insulation calibration ensures stability in extreme environments, ranging from cold storage to desert heat.

ConfigurationTypical Nominal Voltage*Capacity MethodTypical Use
1S 3.6V / 3.7V Parallel cells increase capacity Portable electronics and compact devices
2S 7.2V / 7.4V Custom parallel count Medical and handheld equipment
3S 10.8V / 11.1V Custom Robotics and control devices
4S 14.4V / 14.8V Custom Portable industrial systems
5S 18V / 18.5V class Custom Tools and robotics
6S 21.6V / 22.2V Custom Industrial equipment
7S+ Project dependent Engineered series / parallel structure Advanced OEM battery systems
i

* Voltage Note: Exact nominal voltage depends on the selected lithium-ion cell model and chemistry. Final series / parallel configuration should also be confirmed according to device input voltage, runtime target, continuous current, peak current and charging system.

Custom ItemAvailable OptionsEngineering Focus
Cell Format 14500 / 16340 / 18500 / 18650 / 21700 / 26650 Space, energy and current requirements
Chemistry Li-ion NMC / Project-Specific Li-ion Energy density, current and cycle targets
Voltage Single-cell to multi-series packs Device input and charger matching
Capacity Custom parallel configuration Runtime and battery dimensions
BMS Hardware BMS / Smart BMS Protection, monitoring and communication
Balancing Optional Multi-series pack consistency
NTC Optional temperature sensor Temperature monitoring and charging control
Communication CAN / RS485 / SMBus / UART / Bluetooth Host-device integration
Connector JST / Molex / XT / Anderson / Custom Current capability and interface compatibility
Wire Custom AWG & Length Voltage drop and temperature rise
Packaging PVC / Plastic / Metal Mechanical installation environment
Certification UN38.3 / IEC 62133 / CE / RoHS / MSDS Destination market and final pack design
Get My Custom Li-ion Battery Quote

Proven Battery Manufacturing Safeguards

We intercept structural failure through rigorous material calibration and process integrity, ensuring every unit eliminates hidden costs and survives the toughest real-world environments.

Adaptive BMS Logic

Medium sized packs use Hardware BMS for reliability, while large scale applications like ESS implement Software BMS for advanced monitoring.

Custom Structural Shielding

Standard units feature reinforced PVC or Epoxy board for durability, with custom IP67 housings available when your project requires total moisture protection.

Automated Aging Validation

Every pack undergoes full cycle aging tests to prove stability before shipping to ensure your products arrive 100% ready for the field.

Which Battery Path Fits Your Vision?

Stop guessing between cost and quality. We simplify complex technical choices into two strategic tracks to help you balance durability and budget in 30 seconds.
Custom Li Ion Battery

High Density and Portability

Engineered for lightweight agility where every gram dictates your device’s success.

  • Best for: Handheld medical devices and drones, where every gram counts.

  • My Advice: I mandate NMC chemistry for these projects. A heavy battery destroys the user experience of your handheld tool and reduces your product’s market edge.

  • The Solution: Using high-capacity 18650 or 21700 cells to shrink the pack volume by 20% while maintaining critical run time.

Customize Lifepo4 Battery

Heavy Duty and Longevity

Built for brutal industrial endurance where safety and zero-downtime are the only metrics that matter.

  • Best for: Warehouse AGVs, forklifts, and outdoor power, where safety is the priority.

  • My Advice: I recommend LFP chemistry. It handles 2,000+ cycles and will not catch fire even if punctured or crushed. It’s an investment in your brand’s safety record.

  • The Solution: Pairing prismatic cells with laser-welded steel enclosures to handle years of brutal industrial abuse.

Critical Battery Engineering Selection

Choose the right build logic based on your device power needs and field risks to eliminate project failure and protect your professional reputation from hidden technical liabilities.

Nmc Vs Lfp Battery Chemistry Selection For Portable And Industrial Lithium Packs.

Step 1: Cell Chemistry Selection

  • NMC Chemistry — Best for portable high-performance tools. Offers maximum energy density in a lightweight and compact footprint for mobile applications.

  • LFP Chemistry — Best for industrial-grade endurance. Provides 2,000+ cycles and absolute thermal safety even under heavy mechanical stress or heat.

Step 2: BMS Integration Strategy

  • Standard Protection BMS Best for basic power applications. Focuses on cost-efficiency while maintaining essential safety cut-offs for overcharge and shorts.

  • Smart Communication BMS Best for mission-critical systems. Uses CANBUS/RS232/RS485/Bluetooth to provide real-time health data and prevent unexpected field downtime.
Smart Communication Bms With Canbus And Smbus For Mission Critical Battery Management.

Custom Lithium-ion Battery with Connector & Housing

The battery pack can be delivered as a complete device-ready assembly with customized wiring, connectors, protection, insulation and housing.

Custom Lithium-ion Battery Pack with Connector

Wire gauge, wire length, connector model, polarity and pin definition are selected according to current, voltage and mechanical installation requirements.

JST PHJST XHJST VHMolexXT30XT60AndersonSMDC ConnectorCustom Interface
Customized AWG wire size
Silicone or PVC cable
Custom cable length
Separate charge and discharge cables
NTC and communication wires

Custom Battery Pack Housing & Mechanical Design

Mechanical protection can be engineered according to product installation, vibration, environmental exposure and service requirements.

PVC Heat Shrink

Compact and cost-effective battery pack structure.

Plastic Housing

Suitable for portable and consumer OEM products.

Metal Enclosure

Rugged structure for industrial applications.

Custom Structure

Holders, brackets, insulation, foam and mounting points.

Custom Lithium-ion Batteries for Different Applications

Cylindrical lithium-ion battery packs are widely used in professional equipment requiring rechargeable energy, scalable voltage and reliable pack integration.

Robotics & Automation

18650 and 21700 battery packs with custom BMS for robots and automation equipment.

Medical Devices

Cell-matched battery packs with NTC, protection circuits and customized connectors.

IoT Devices

Compact rechargeable battery solutions for connected devices and monitoring equipment.

Security Devices

Rechargeable power for alarms, access-control and security electronics.

Smart Home

Battery solutions for smart locks, controllers and connected home equipment.

Portable Instruments

Custom packs for meters, scanners, measurement equipment and field devices.

Industrial Equipment

Rugged battery packs with customized BMS, housing and communication options.

Power Tools

High-current cylindrical cells with optimized connections and protection.

GPS Trackers

Compact rechargeable lithium-ion battery packs for mobile tracking devices.

Portable Lighting

14500, 16340 and 18650 packs for flashlights and professional lighting equipment.

Mobility Devices

High-energy multi-series lithium-ion packs for portable mobility applications.

Backup Equipment

Customized capacity and pack architecture for rechargeable backup systems.

Avoiding Common Lithium-ion Battery Pack Design Mistakes

We use decades of experience to intercept technical risks and protect your professional reputation from low-quality builds and hidden liabilities.

 
Common Mistake 01

Choosing Cells Only by Capacity

High capacity alone does not guarantee suitable current capability or low resistance.

LithoTop Advice: Evaluate capacity, continuous current, peak current and resistance together.
Common Mistake 02

Ignoring Cell Matching

Unmatched cells may create uneven discharge, temperature and aging behavior.

LithoTop Advice: Match voltage, internal resistance and relevant cell characteristics.
Common Mistake 03

Undersizing the BMS

A BMS selected only around average current may trip during normal peak loads.

LithoTop Advice: Define continuous current, peak current and peak duration.
Common Mistake 04

Ignoring Peak Current

Motors, radios and actuators may draw short current peaks well above average load.

LithoTop Advice: Include startup and transient loads in battery design.
Common Mistake 05

Wrong Wire or Connector

Undersized interfaces can increase voltage drop and heat.

LithoTop Advice: Select wire AWG and connector rating according to real load current.
Common Mistake 06

No Space for Pack Tolerance

Cells may fit while BMS, insulation, wiring or connector bend space does not.

LithoTop Advice: Design around maximum finished battery dimensions.

Custom Lithium-ion Battery Case Studies

Real-world case studies from procurement leads and engineers who switched to our audited battery solutions to eliminate field failures.

Industrial Equipment

Compact Multi-Series Pack for an Industrial Controller

Customer
European industrial equipment developer
Challenge
Limited enclosure volume with short peak-current demand.
Solution
Cylindrical Li-ion configuration with custom BMS, wiring and connector layout.
Validation
Mechanical fit, peak-load testing, charging and aging evaluation.
Medical Devices

Custom Battery Pack for Portable Medical Equipment

Customer
North American medical-device engineering team
Challenge
Stable runtime, temperature monitor and defined connector.
Solution
Matched cylindrical cells with PCM/BMS, NTC and custom wire harness.
Validation
Capacity, temperature, connector and device-fit testing.
Robotics

21700 Battery for a Compact Robotics Platform

Customer
Asian robotics integrator
Challenge
High pulse current and communication requirements in a limited space.
Solution
21700 cells with smart BMS and customized communication interface.
Validation
Peak-current, temperature, communication and runtime.

Our Expertise in Action

Can a Lithium-Polymer battery be charged by a Li-ion charger?

Can a Lithium-Polymer battery be charged by a Li-ion charger?

What are the methods of testing 21700 size Li ion cells?

What are the methods of testing 21700 size Li ion cells?

How do lithium manganese batteries thrive in marine applications?

How do lithium manganese batteries thrive in marine applications?

The Biggest Mistake When Choosing a UAV Battery Supplier?

The Biggest Mistake When Choosing a UAV Battery Supplier?

Have a Question?

FAQ

Get clear technical answers to stop production risks and protect your project.

Please provide required voltage, capacity, maximum battery dimensions, continuous current, peak current, charging method, connector, wire length, operating temperature, estimated quantity and certification market.

Safety is our non-negotiable baseline. We don’t just hope for the best; we install redundant BMS circuits and NTC thermal sensors that physically shut down power before heat even has a chance to build up.

Sure. Branded cell options can be evaluated according to project requirements, cell availability, discharge performance, certification and supply conditions.

Consistency is the backbone of reliability. We utilize automated matching systems to pair cells by voltage and internal resistance, ensuring your entire production run maintains peak performance.

We build for the long haul because your reputation is on the line. By sourcing only Grade A cells with verified cycle data, we ensure your devices stay powered long after the initial launch.

Absolutely—digital integration is critical for modern systems. We specialize in Smart BMS programming, including CANBus and SMBus, to ensure a perfect technical handshake with your hardware.

Start Your Free Custom Battery Audit

Your high-stakes hardware project carries a heavy professional weight for your team and your brand.

We handle the deep technical work, from custom BMS communication protocols to precision Li-ion cell matching, so you never have to face embarrassing field failures or costly battery recalls on your delivery day.

12h Expert Response

Free Battery Design Audit

360+ Certified Cell Library

Get Your Factory-Direct Quote

Response within 12 hours. Save up to 30% on bulk orders.

🔒 100% Privacy. No Hidden Costs. Free Sample Options.

Get Your Factory-Direct Quote

Response within 12 hours. Save up to 30% on bulk orders.

🔒 100% Privacy. No Hidden Costs. Free Sample Options.

close menu icon

Get Free Quote

We will contact you within 24 hours.
Don't worry, we hate spam too!