🔋

OKJET LITHIUM BUILDER MASTERKIT

Build & Sell Lithium Battery Packs Like a Pro

By Engr. Jethro | OKJET SOLAR TECH — Edition 2026/2027

Stop guessing. Start building batteries that actually work — and actually sell.

If you've ever tried to learn lithium battery building from scattered YouTube videos, half-explained wiring diagrams, and forum posts that contradict each other, you already know the problem: nobody puts it all together in one place. One video shows you a BMS. Another shows you a spot welder. None of them show you how to actually calculate a pack, test your cells, avoid a fire hazard, or price your work so you don't lose money on every job.

This book is the one place.

The OKJET LITHIUM BUILDER MASTERKIT is a complete, 78-page, professionally written handbook that takes you from "I don't know where to start" to "I can confidently build, test, and sell a lithium battery pack" — covering both Li-ion and LiFePO4 chemistries, from raw cells to a finished, protected, customer-ready product.

🛠️ What You'll Actually Learn

✅ Safety first — understand thermal runaway, short circuits, and every real failure mode before you touch a cell, so you build with confidence, not fear

✅ Both major chemistries explained side-by-side — Li-ion vs LiFePO4, with a full comparison table and a clear answer to "which one should I use for my inverter, e-bike, or solar system?"

✅ Every calculation you need — series, parallel, and series-parallel wiring explained with real diagrams; voltage, Ah, Wh, and kWh worked out step-by-step with real numbers, not vague theory

✅ Cell testing and matching — how to stop trusting the number printed on the wrapper and start testing cells like a professional

✅ A full BMS masterclass — how to choose, wire, and troubleshoot a BMS, with clear wiring schematics showing exactly how balance taps and main power paths work

✅ Hands-on skills — nickel strip and busbars, spot welding, fuses, cable sizing, connectors, enclosure design — the physical build, explained properly

✅ Charging and solar integration — CC/CV charging, MPPT vs PWM, and how to size a solar array to your battery bank

✅ Installation, troubleshooting, and maintenance — what to do when a pack doesn't charge, won't hold voltage, or trips your inverter

✅ The business side — how to price your work properly, avoid underpricing your skill, write a warranty customers can trust, and turn this into real income

📘 Packed With Real Tools, Not Just Theory

This isn't a thin PDF with recycled internet content. Inside you'll find:

🖼️ Custom wiring diagrams — series, parallel, and series-parallel connections, plus BMS wiring schematics, drawn for accuracy

📊 Reference tables you'll return to on every job — configuration libraries, cable sizing guides, fuse selection charts

📝 Ready-to-use templates — a build/test log, a customer warranty outline, and a full tools checklist

❓ A no-nonsense FAQ answering the questions every beginner actually asks

⚠️ A "Top Beginner Mistakes to Avoid" section — so you skip the expensive lessons others learned the hard way

🎯 A guided first practice build — a real starter project so you finish this book with a plan, not just knowledge

👤 Who This Is For

Solar installers who want to offer battery storage to clients

DIY tech enthusiasts ready to build their first real pack

Entrepreneurs who want to turn battery building into a side hustle or full business

E-bike, e-scooter, and off-grid power owners who want to understand what's really inside their battery

Anyone tired of piecing together unreliable information for free and ready to just get it right

Whether you're in Lagos, Nairobi, London, or anywhere else — this book uses global standards and plain English, so it works wherever you are.

🔥 Why This Book, Why Now

Lithium battery skills are only getting more valuable — solar power, e-mobility, and backup energy systems aren't going anywhere. The people who understand how to build, test, and sell battery packs safely and professionally are the ones who will keep getting called for jobs. This book gives you that skill in one sitting, written by someone who actually builds — not just talks.

📲 Get Instant Access

Download the OKJET LITHIUM BUILDER MASTERKIT now and start building your first pack this week.

Even if you later lost this App, You can still get it back from me for Free, Just contact me on WhatsApp.

Have a question before you buy, or want to see what OKJET SOLAR TECH can do for your solar or DIY tech business?

👉 Chat with us directly on WhatsApp: wa.me/+2347032944234

OKJET SOLAR TECH — practical skills, taught properly.