We are seeking an experienced electronics engineer to integrate a Battery Management System (BMS) IC—specifically a 3-cell (3S) Li-ion charger IC like the BQ25700A or similar—into our existing PCB design. The current board is built around an ESP32 and controls a range of low-power peripherals. Our goal is to enable safe battery charging and protection using an onboard BMS IC.
Project Scope:
Review existing PCB and schematic files (provided in EasyEDA or exported format).
Select or confirm appropriate BMS IC to:
Charge a 3S Li-ion battery pack (12.6V max),
Support input from a regulated 12V–15V DC source,
Provide battery protection and system power regulation,
Ideally support I²C or SMBus communication.
Modify schematic and PCB layout to integrate the BMS IC.
Power path management,
Input current limiting,
Battery charge/discharge control,
Optional status and control pins to ESP32.
Update BOM and add any required passives, FETs, or protection circuits.
Provide ERC/DRC-clean schematic and layout files.
Deliver manufacturing-ready Gerbers, BoM, and annotated schematic.
Deliverables:
Updated schematic (EasyEDA, KiCAD, or other open-source format preferred).
Modified PCB layout files.
Updated BOM with suggested part numbers (preferably from LCSC or Digi-Key).
Gerber files for fabrication.
Basic test instructions or design notes. Requirements:
Proven experience in BMS and charger IC design (especially for Li-ion).
Experience with ESP32-based systems and mixed power domains.
Familiarity with thermal layout, grounding, and safe battery charging practices.
Clear and timely communication.
Dear Client,
Thank you for sharing your project details. From your description, it seems you’re looking for an experienced electronics engineer specializing in circuit and PCB layout design.
I am Engr. Saddam Gul, an electronics engineer with over 5 years of expertise in circuit design and PCB layout. Throughout my career, I have successfully completed numerous challenging projects, demonstrating precision and creativity in every design. You can find examples of my work in my portfolio, which highlights the quality and scope of my past achievements.
I would love to learn more about your project requirements and discuss how I can contribute to its success. Feel free to share additional details or reach out if you’d like to collaborate further.
Thank you for your time and consideration. I look forward to the opportunity to work together.
Best regards,
Engr. Saddam Gul
$750 NZD en 7 días
4,9
(153 comentarios)
7,4
7,4
43 freelancers están ofertando un promedio de $473 NZD por este trabajo
As an electronics professional with broad experience in the multitude of domains outlined in your project description, I am confident that I have the skills necessary to expertly integrate the BMS IC into your existing PCB design. My extensive knowledge of power electronics will ensure safe battery charging and protection along with battery management system (BMS) intellect. Additionally, my flair for circuit design, electrical engineering, and embedded systems will enable a seamless integration of critical features such as power path management, input current limiting, and precise charge/discharge control.
I have worked on numerous projects dealing with Li-ion battery chargers under different capacity demands, so I completely understand the significance of selecting or confirming the appropriate IC for your specific requirements. Moreover, I am well-versed with I²C and SMBus communication protocols which will enable smooth functioning and communication between your ESP32 board and the BMS IC.
Furthermore, I'm familiar with grounding techniques, thermal concerns, and safe battery charging practices that are especially paramount for a project of this nature. Rest assured knowing that not only can I provide a manufacturing-ready GERBER file without any DRC issues but can also assist you in sourcing components from preferred vendors like LCSC or Digi-Key.
Hi there,
I’ve reviewed your project requirements and can seamlessly integrate a 3S Li-ion BMS IC like the BQ25700A into your existing ESP32-based PCB design. With strong experience in battery management, charger ICs, and power path control, I’ll ensure safe, efficient charging and system protection — complete with I²C/SMBus support and clean integration with your ESP32.
I’ll provide updated schematics, layout, BOM, and ready-to-fabricate files — all aligned with best practices for thermal design and mixed-voltage domains. Just send me the current files to get started.
Best regards,
Samuel Tshibangu
Hello, I am an experienced Electrical Engineer with over 6 years in PCB design. I work as an Embedded System Design Engineer in a reputed firm. I have designed up to 8-layer PCBs including mixed-signal, power converter, and analog circuits. I am also skilled in firmware development. I can help you integrate the BMS IC into your ESP32 board, modify the schematic, layout, and provide complete production files. I understand battery protection, safe charging, and power management. Looking forward to working on your project.
With a strong background in BMS and charger IC design, I am exceptionally qualified for the unique task before you. My proficiency in PCB design and development, coupled with my familiarity in thermal layout and grounding practices, will enable me to seamlessly integrate the 3-cell Li-ion charger IC into your existing design while ensuring safe battery charging and protection -- this is crucial for Li-ion applications.
I also have substantial experience working with ESP32-based systems, which aligns with your needs. My competence in mixed power domains further reinforces my suitability for this project, given that you require a design that controls a range of low-power peripherals.
Furthermore, I appreciate the value of communication in any project's success. That's why you can trust me to consistently update you on the progress, promptly addressing any inquiries along the way. You will not only receive manufacturing-ready deliverables but also gain design notes or basic test instructions that will prove invaluable as you assess quality. Let me demonstrate my expertise by integrating the ideal BMS IC into your PCB, ensuring efficient power management while enabling effective control pins to ESP32.
Hello there,
I can integrate a Battery Management System (BMS) IC into your existing ESP32-based PCB design. My goal is to enable safe and efficient charging and protection for a 3-cell (3S) Li-ion battery pack. I will begin by thoroughly reviewing your current PCB and schematic files, then carefully select and integrate a suitable BMS IC. My focus will be on establishing robust power path management, implementing effective input current limiting, and ensuring precise battery charge/discharge control. This will involve the necessary modifications to your schematic and PCB layout, incorporating all required passive components, FETs, and critical protection circuits. I will deliver ERC/DRC-clean schematic and layout files, alongside manufacturing-ready Gerbers, an updated Bill of Materials (BOM), and a fully annotated schematic, ensuring a seamless transition from design to production.
I have experience of successfully integrating similar charging solutions into various electronic products, including those built around ESP32-based systems and involving complex mixed power domains. My expertise encompasses critical aspects of thermal layout, optimal grounding techniques, and adherence to all safe battery charging practices. I am excited to work on your project and confident to deliver you the required circuit.
Hey there! I’m Alok,
A PCB, Circuit and Mechanical designer with a passion for turning ideas into rock-solid, high-performance circuit boards.
even expert on Python, C, C++
With nearly a decade of experience, I’ve tackled everything from compact consumer gadgets to complex industrial systems—always with a focus on precision, efficiency, and reliability.
# Schematic & Layout Design – Clean, optimized, and manufacturable.
# Component Selection & Library Management – No surprises, just the right parts for the job.
# Reverse Engineering – PCB cloning, replication, and improvements.
# Gerber, BOM & CPL Generation – Ready for seamless production.
# DFM & DFA Expertise – Because great design means smooth manufacturing.
# Multi-Layer, Flex, & High-Density PCB Design – Whatever the project needs.
If you need a PCB and Code that’s efficient, reliable, and built for real-world performance, let’s chat. I’d love to help bring your project to life!
Hello! I'm a highly skilled PCB Designer with over 9 years of expertise in delivering reliable and efficient PCB designs. I specialize in creating precision designs tailored to client's needs, utilizing top-tier design tools such as Altium Designer, Autodesk Eagle, KiCad, EasyEDA, Siemens PADS, DipTrace, Proteus, Fritzing and OrCAD. My goal is always to ensure the highest quality and performance in every project.
Core Expertise :
• Schematic Capture & Layout Design
• Component Selection & Library Management
• Reverse Engineering (PCB Replication, PCB Cloning)
• Gerber, BOM, and CPL File Generation & Manufacturing Support
• Design for Manufacturability (DFM) and Design for Assembly (DFA)
• PCB Design & Development (Single, Double, Multi-Layer, Flexible PCBs)
Industries Served :
• Medical Devices
• Telecommunications
• Consumer Electronics
• Industrial Equipment
• Automotive Electronics
• Safety and Security Devices
Why Choose Me?
• Attention to Detail and Commitment to Quality
• Strong Communication Skills & Client-Centric Focus
• Timely Delivery & Flexible Approach to Meet Project Requirements
I would love to help you with your next PCB design project. Feel free to reach out, and let’s discuss how I can bring your ideas to life!
Best Regards,
Utpal
Hello,
I’m an experienced electronics and PCB design engineer with a strong background in BMS integration and ESP32-based systems. I can review and modify your schematic and PCB layout to seamlessly integrate a 3S Li-ion charger IC like the BQ25700A. I’ll ensure safe power path management, current limiting, and I²C/SMBus support with proper grounding and thermal layout. You’ll receive clean schematic/layout files, a complete BOM, and Gerbers ready for manufacturing. I work with EasyEDA and KiCad and ensure reliable, production-ready designs. Let’s make your board battery-safe and efficient. Looking forward to collaborating!
My name is Dervis, an experienced and versatile electrical engineer who has worked on various projects; from industrial automation to wastewater treatment. I'm adept at designing complex systems and my skills align perfectly with your project requirement. One of my key achievements lies in my proficiency with the Siemens TIA Portal program and the Simatic Manager program, both of which are integral in ensuring efficient automation like your project demands. This coupled with my experience using the E plan P8 V2.6 program for Electrical Projects, gives me a unique edge in executing your PCB design.
Ultimately, I have the skill set necessary for this task; from reviewing existing PCB designs to identifying appropriate ICs (e.g., charger IC) and modifying schematics, I can handle it all. My communication style is clear and punctual – experiences often cited as key in successful collaboration. Let's make a great team - choosing me would provide you not only with technical excellence but also open communication channels and peace of mind throughout the process.
Hello,
I am an Embedded Systems R&D Manager with 8+ years of experience in hardware and firmware development. I specialize in ESP32-based systems, battery management (3S Li-ion), and power-efficient PCB design. I have previously integrated BMS ICs like BQ25700A, BQ769x0, and SYR837 in several projects.
I have reviewed your project in detail and can assist with:
Reviewing and modifying your schematic and PCB (EasyEDA or KiCad)
Selecting and integrating the best 3S BMS IC (BQ25700A or equivalent)
Implementing power path management, current limiting, and protection circuits
Interfacing BMS with ESP32 using I2C or GPIO
Providing updated schematic, BOM (LCSC/Digi-Key), Gerbers, and design notes
My workflow includes thermal optimization, grounding, EMI considerations, and ensuring safe charging/discharging of Li-ion batteries. I work with EasyEDA Pro, KiCad, and Altium, and follow IPC and JEDEC standards for robust and reliable PCB designs.
Let’s discuss how I can support your project from review to final production files.
Best regards,
Best 3S Li-ion BMS Integration Expert for ESP32 Boards! ⭐⭐⭐⭐⭐
Dear Client,
I can help integrate a robust BMS circuit into your ESP32-based PCB using a charger IC like BQ25700A. With 30+ years of experience in battery management, power path design, and ESP32-based hardware, I’ll ensure a clean, safe, and production-ready design update.
✅ Valuable Suggestion: To improve charging safety and performance, I recommend adding external current limiting FETs and designing proper ground separation between the power and logic domains.
✅ Similar Projects:
1. 3S Li-ion power board for a remote data logger with ESP32
2. Smart battery-powered wearable with USB-C and integrated BMS
3. BMS retrofit for a solar-powered IoT system with fuel gauge feedback
✅ What I’ll Deliver:
1. Updated schematic with 3S BMS IC and power path logic
2. Modified EasyEDA/KiCAD PCB layout
3. Updated BOM with LCSC or Digi-Key part links
4. ERC/DRC-clean outputs and manufacturing-ready Gerbers
5. Design notes and basic test procedure
✅ Quick Question: Do you plan to use I²C/SMBus communication with the BMS, or is standalone autonomous charging sufficient for your use case?
✅ Free 15-Minute Consultation: I’d be happy to review your current schematic and suggest key improvements before we begin.
Looking forward to helping you build a safe and efficient battery-powered system.
Best regards,
PCB Must Innovations
With a comprehensive skill set in Circuit Design, Electrical Engineering and Electronics, combined with extensive experience in embedded systems, I can confidently affirm that I'm the ideal candidate for your project. My proficiency is underscored by my proven track record in handling similar projects - BMS and charger IC design for Li-ion batteries - which aligns perfectly with your requirements.
Additionally, my familiarity with ESP32-based systems and mixed power domains prepares me to flawlessly integrate the BQ25700A into your existing PCB design while ensuring proper battery charging and protection. Thermal layout, grounding, and adherence to safe battery charging practices are integral aspects of my work process, virtues that will be vital in this project.
Finally, I value clear and timely communication which I believe will enhance our working relationship throughout this project. You can trust me to update the schematic, modify the PCB layout, provide ERP/DRC-clean files as well as delivering manufacturing ready Gerbers on time. Partnering with me will not only guarantee a successful completion but also an optimized solution.
Are you looking for an experienced electronics engineer to integrate a Battery Management System (BMS) IC BQ25700A or similar into your existing PCB design. I’ve got your back.
Hi,
I am Zain. I can easily handle the task including
• Circuit Design
• PCB Design
• MS / ECM / PDN etc
• Embedded Systems
• Firmware Development
• MATLAB
• Simulations etc.
Lets chat.
Best regards
Hi there!
I'm excited to bid on your project — I specialize in delivering high-quality PCB designs and embedded solutions for clients worldwide. With a strong track record in hardware prototyping, circuit optimization, and production-ready layouts, I’m confident I can bring your vision to life — on time and on budget.
? Why choose me?
✅ Expert in Altium, KiCad, Eagle & EasyEDA
✅ Hands-on experience with ESP32, STM32, NRF, Arduino & custom modules
✅ Skilled in power design, RF layout, BLE, sensor integration, and EMI/DFM
✅ Clean schematic-to-layout workflows, complete with BOM & Gerbers
✅ Familiar with JLCPCB, PCBWay, and manufacturing-ready standards
? I’ve successfully completed projects involving:
Battery-powered wearables
BLE + sensor data loggers
Solar MPPT chargers
High-precision analog designs
? Deliverables I provide:
Schematic & PCB Layout
Production-ready Gerbers & BOM
Let’s collaborate to build something exceptional. I’m available to start right away.
Looking forward to working with you!
Best regards,
Muhammad Usman
✅Electronics Specialist | Hardware Expert
Hi,
I have strong experience with ESP32-based systems and Li-ion BMS integration. I can help you cleanly integrate a 3S charger IC like BQ25700A into your existing PCB by reviewing the schematic and layout, confirming the best IC choice (or proposing better alternatives like BQ24133/BQ24610), and ensuring safe charging, power path control, and ESP32 interfacing.
I’ll add proper current limiting, thermal layout, protection FETs, and GPIO/I²C communication with the ESP32 where needed. I’ll deliver a verified schematic, routed PCB layout (EasyEDA or KiCad), clean BOM with LCSC or Digi-Key parts, and ready-to-fabricate Gerber files.
You can also check my previous projects, which include advanced ESP32-based systems with power management and multi-cell battery protection. I ensure high-quality results with fast delivery and clear communication.
Looking forward to working on this with you!
Best regards,
Mahmoud Ibrahim
Circuit Design & PCB layout Engineer
Hello, my name is Rachid, I am an electronic developer with experience in developing complete electronic products, including electrical schematic design, PCB design, firmware development, testing, etc. I can start working immediately and I can help you develop a perfect project, send me a message to discuss the details and get started.
Hello there!
I am prepared to undertake your PCB Design & BMS Integration project with precision and expertise. My proven experience in BMS and Li-ion charger IC design, coupled with skills in Electrical Engineering, Circuit Design, and PCB Layout, ensures a seamless integration process. I will review your existing PCB files in EasyEDA, select the optimal BMS IC for 3S Li-ion charging, modify schematics, and deliver ERC/DRC-clean files. Expect updated schematics, PCB layouts, BOM, Gerber files, and design notes for a successful project completion. Let's collaborate to achieve safe battery charging and protection efficiently.
Cheers, RedBrick American Engineering
With over five years of experience in electronic circuit design and involving Li-ion charger ICs and Battery Management Systems (BMS), I am more than equipped to handle your project. My past projects include designing drone flight controllers, smart energy meters, IoT gateways, and Battery Monitoring System all of which demanded the same precision, safety, and efficiency that your PCB integration requires.+
My deep knowledge of BMS's best practices for Li-ion batteries matches the challenge you're facing accurately. I am well-versed with every aspect of the process—from selecting the right IC like BQ25700A for particular voltage requirements, to ensuring safe battery charging and protection through input current limiting, power path management, and battery charge/discharge control. Furthermore, with my familiarity with ESP32 systems and mixed power domains, I can seamlessly integrate the chosen IC while maintaining the critical functionality your board carries.
Note: I have already work done on Battery Monitoring System for 10 battery and single battery. If you want to check sample design let's start the discussion on project what I have done and your project requirements.
I will do:- Simple to advanced Circuit design and analysis using software tools such as KiCAD, Proteus, Altium Designer, Allegro, PADs, and Eagle
My package provides the following services
- Schematic drawings
- Gerber files
- Netlist generation
- Pcb's
- BOM generation (Professional BOM)
- 3D Models of the Actual PCB
- ECAD Library Administration
I will also generate Gerbers on existing PCBs files
