How to DIY a 10S5P Lithium Battery Pack? (36V 15Ah 18650 3000mAh Guide)
Are you looking to build a reliable, high-performance 10S5P lithium battery pack for your electric scooter, small electric vehicle, solar energy storage system, or robot? A 10S5P 36V 15Ah battery pack, made with 18650 3000mAh cells and a 30A BMS protection board, is the perfect balance of power, capacity, and safety for medium-power applications. In this comprehensive DIY guide, we’ll walk you through every step of assembling a 10S5P lithium battery pack—from cell selection to final testing—with clear instructions and pro tips. Plus, we’ve prepared a detailed 10S5P lithium battery pack assembly video to make the process even easier. Don’t have the time or tools to DIY? Contact us for custom 10S5P 36V 15Ah battery packs tailored to your needs!
What Is a 10S5P 36V 15Ah 18650 Lithium Battery Pack?
Before diving into the DIY process, it’s essential to understand what a 10S5P lithium battery pack is and why it’s a popular choice for DIY enthusiasts and small device builders. Let’s break down the key specifications:
10S Configuration: 10 lithium-ion cells connected in series (10S) to deliver a nominal voltage of 36V (42V when fully charged). This voltage is ideal for electric scooters, e-bikes, and small motors that require stable mid-range power.
5P Configuration: 5 cells connected in parallel (5P) to boost the total capacity to 15Ah. Using 18650 3000mAh cells, 5 parallel cells per group (5 × 3000mAh = 15000mAh = 15Ah) ensures long runtime for your devices.
Total Cells: A 10S5P battery pack requires 50 pieces of 18650 3000mAh lithium-ion cells (10 series groups × 5 parallel cells each).
30A BMS Protection Board: A 30A BMS (Battery Management System) is critical for safety—it protects the battery pack from overcharge, over-discharge, over-current, short-circuit, and overheating, ensuring long lifespan and safe operation.
This 10S5P 36V 15Ah battery pack is versatile, compact, and cost-effective—making it one of the most sought-after DIY battery projects for hobbyists and professionals alike.
To build a safe, durable 10S5P lithium battery pack, you’ll need the right tools and materials. We’ve listed all the essentials below—prioritize high-quality components to avoid safety risks and ensure long battery life:
50 × 18650 3000mAh lithium-ion cells (same brand, model, and internal resistance for consistency)
18650 battery holder or battery assembly board (to organize cells securely)
Pure nickel strips (0.15mm–0.2mm thickness, for reliable welding connections)
Spot welder (essential for safe, strong connections between cells—avoid soldering, which can damage cells)
Insulation paper, heat-shrink tubing (for electrical insulation and packaging)
Electrical tape, hot glue gun, or epoxy resin (to secure components and prevent movement)
Multimeter (to test voltage, connections, and battery balance)
Wires (14–16 AWG, for main power connections)
Output connector (XT60, DC power connector, or custom connector for your device)
Safety Note: Always wear insulated gloves when working with lithium-ion cells. Work in a dry, well-ventilated area away from flammable materials. Never short-circuit 18650 cells—this can cause overheating, fire, or explosion.
Step-by-Step Guide to DIY 10S5P 36V 15Ah 18650 Battery Pack
Follow these detailed steps to assemble your 10S5P lithium battery pack. For visual guidance, watch our 10S5P lithium battery pack assembly video (embedded below) to see each step in real time.
Step 1: Select & Match 18650 3000mAh Cells (Critical for Longevity)
Cell consistency is the key to a reliable 10S5P battery pack. Mismatched cells (different voltage, capacity, or internal resistance) will cause uneven charging and discharging, reduce battery life, and create safety hazards. Here’s how to sort and match your 18650 cells:
Use a multimeter to test the voltage of each 18650 3000mAh cell. All cells should have a voltage of 3.6V–3.7V (semi-charged), with a maximum difference of 0.05V between cells.
If you have a cell tester, check the internal resistance of each cell. Cells with similar internal resistance (difference ≤ 10mΩ) will perform better together.
Sort the 50 cells into 10 groups of 5 cells each. Each group will form a 5P parallel module—ensure each group has cells with nearly identical voltage and internal resistance.
Each 5P parallel module combines 5 18650 3000mAh cells to create a 3.6V 15000mAh (15Ah) module. Follow these steps to build the parallel groups:
Place 5 cells into the battery holder, ensuring all positive (+) and negative (-) poles are aligned correctly (positive on one end, negative on the other).
Cut nickel strips to size: one strip for the positive terminals and one strip for the negative terminals of the 5 cells.
Use a spot welder to weld the nickel strip to the positive terminals of the 5 cells. Weld 2–3 spots per cell to ensure a strong connection (avoid over-welding, which can damage cells).
Repeat the process for the negative terminals, welding another nickel strip to all 5 negative poles.
Use a multimeter to test the voltage of the parallel module—it should read 3.6V–3.7V. If the voltage is too low or high, check your welding connections.
Repeat steps 1–5 to build 10 identical 5P parallel modules (you’ll need 10 modules for the 10S series connection).
Step 3: Connect 10 Parallel Modules in Series (10S) to Reach 36V
Connecting the 10 parallel modules in series will raise the total voltage to 36V (10 × 3.6V = 36V). This is the core step to create your 10S5P 36V 15Ah battery pack:
Arrange the 10 5P parallel modules in a straight line or compact layout (depending on your packaging needs).
Cut nickel strips to connect the modules in series: each strip will connect the negative (-) terminal of one module to the positive (+) terminal of the next module.
Weld one end of the nickel strip to the negative terminal of the first module, then weld the other end to the positive terminal of the second module. Repeat this for all 10 modules until they are connected in a chain.
After connecting all 10 modules in series, use a multimeter to test the total voltage of the battery pack. It should read 36V–37V (normal for semi-charged cells). If the voltage is lower than expected, check for loose or missing welds.
Step 4: Install the 30A BMS Protection Board (Safety First)
The 30A BMS protection board is the “brain” of your 10S5P battery pack—it prevents overcharge, over-discharge, over-current, short-circuit, and overheating. Incorrect BMS installation can damage the battery pack or cause safety risks, so follow these steps carefully:
Identify the BMS terminals: Most 10S BMS boards have terminals labeled B- (main negative), B1–B10 (balance wires), P- (output negative), and P+ (output positive).
Connect the main negative (-) terminal of the 10S5P battery pack to the BMS B- terminal using a short, thick wire (14 AWG recommended).
Connect the balance wires: Cut small lengths of wire (18–20 AWG) and connect each series connection point (between modules) to the corresponding BMS balance terminal (B1 to B10). Ensure the balance wires are connected in order—mixing them up will damage the BMS.
Connect the main positive (+) terminal of the battery pack to the BMS P+ terminal. Then connect your device’s load to the BMS P- and P+ terminals (use the output connector you prepared earlier).
Double-check all wiring to ensure no reverse polarity (positive to negative) and no loose connections. A reverse connection can fry the BMS and battery pack.
Proper insulation and packaging protect the battery pack from physical damage, short-circuits, and moisture. Follow these steps to secure and insulate your DIY 10S5P battery pack:
Wrap the entire battery pack (modules and BMS) with insulation paper to cover all conductive parts (nickel strips, terminals, wires).
Slide the insulated battery pack into a heat-shrink tubing (large enough to fit the entire pack). Use a heat gun to shrink the tubing—this will create a tight, protective layer around the pack.
Use a hot glue gun to secure the BMS and output connector to the battery pack, preventing movement during use.
Wrap any exposed wires with electrical tape for extra insulation. Ensure the output connector is secure and easily accessible for charging and connecting to your device.
Step 6: Test & Activate Your DIY 10S5P Lithium Battery Pack
Before using your 10S5P 36V 15Ah battery pack, perform these tests to ensure it’s safe and functional:
Use a multimeter to test the total output voltage (between P- and P+ on the BMS). It should read 36V–42V (depending on charge level).
Test the BMS balance function: Charge the battery pack with a 36V lithium battery charger (set to 42V) and monitor the balance wires with a multimeter—each cell group should charge evenly.
Perform a small-load discharge test: Connect a compatible load (e.g., a small motor or LED light) to the battery pack and run it for 10–15 minutes. Check for overheating, loose connections, or voltage drops.
Charge the battery pack to full (42V) and discharge it fully (to 30V, the BMS will cut off power before over-discharging) to activate the cells and ensure proper performance.
Watch Our 10S5P Lithium Battery Pack Assembly Video
DIY 10S5P battery pack assembly can be tricky—especially for beginners. That’s why we’ve created a detailed 10S5P lithium battery pack assembly video that shows every step in real time. Our video covers:
How to select and match 18650 3000mAh cells
Spot welding techniques for parallel and series connections
30A BMS protection board wiring (step-by-step)
Insulation and packaging tips for durability
Final testing and activation
Watch the video alongside this guide to avoid mistakes and build a professional-grade 10S5P 36V 15Ah battery pack at home.
Custom 10S5P 36V 15Ah Battery Packs – Contact Us Today!
Not everyone has the tools, time, or experience to DIY a 10S5P lithium battery pack. If you want a ready-to-use, high-quality 10S5P 36V 15Ah battery pack without the hassle, we offer custom battery solutions tailored to your needs. Our custom 10S5P battery packs include:
Premium 18650 3000mAh lithium-ion cells (matched for consistency)
Professional spot welding and wiring (strong, durable connections)
Custom size, shape, and output connector (XT60, DC, or your preferred connector)
Full testing before delivery (voltage, balance, and discharge tests)
We specialize in manufacturing custom lithium battery packs for electric scooters, e-bikes, robots, solar energy storage, industrial equipment, and more. Whether you need a standard 10S5P 36V 15Ah battery pack or a custom configuration, we’ve got you covered. Contact us today to get a quote for your custom 10S5P lithium battery pack!
FAQs About DIY 10S5P 36V 15Ah 18650 Battery Packs
Q1: Can I use different brands of 18650 3000mAh cells for my 10S5P battery pack? A: We recommend using the same brand, model, and batch of 18650 3000mAh cells. Different brands may have varying voltage, capacity, and internal resistance, which can cause uneven charging/discharging and reduce battery life. If you must mix brands, ensure all cells have identical voltage and internal resistance.
Q2: Why do I need a 30A BMS for a 10S5P 36V 15Ah battery pack? A: A 30A BMS is designed to handle the maximum discharge current of the battery pack. Most 10S5P 36V 15Ah battery packs are used for devices that draw 10–25A (e.g., electric scooters, small motors), so a 30A BMS provides a safe buffer to prevent over-current damage. Using a lower-amperage BMS can cause it to trip or fail.
Q3: Can I solder 18650 cells instead of spot welding for my 10S5P battery pack? A: We do not recommend soldering 18650 cells. Soldering generates high heat (over 200°C), which can damage the cell’s internal components, reduce capacity, and create safety hazards. Spot welding is the safe, reliable method for connecting 18650 cells—it uses short, low-heat pulses to bond nickel strips to the cells without damaging them.
Q4: How long will a DIY 10S5P 36V 15Ah battery pack last? A: With proper cell selection, BMS installation, and maintenance, a 10S5P 36V 15Ah battery pack made with 18650 3000mAh cells can last 500–1000 charge cycles (2–3 years of regular use). To extend lifespan, avoid overcharging, over-discharging, and extreme temperatures.
Q5: What charger should I use for my 10S5P 36V 15Ah battery pack? A: Use a dedicated 36V lithium-ion battery charger with a charging voltage of 42V (the full charge voltage for 10S lithium battery packs). The charger current should be 1.5A–3A (10–20% of the battery capacity) for safe, efficient charging. Do not use a lead-acid battery charger—this will damage the lithium battery pack.
Conclusion
DIY a 10S5P 36V 15Ah lithium battery pack with 18650 3000mAh cells and a 30A BMS protection board is a rewarding project that saves you money and gives you a custom power source for your devices. By following the steps in this guide and watching our 10S5P lithium battery pack assembly video, you can build a safe, reliable battery pack at home.
If DIY isn’t for you, our custom 10S5P battery packs are designed to meet your specific needs—with premium components, professional assembly, and full testing. Whether you’re a hobbyist, engineer, or small business owner, we’re here to help you get the perfect 10S5P 36V 15Ah battery pack.
Contact us today for your custom 10S5P lithium battery pack quote!
