Stop buying battery packs. Start building them. This hands-on 8-module course takes you from understanding lithium cell chemistry to assembling, welding, wiring, and commissioning a complete battery pack — built for EV and electric motocross conversions. Learn to source cells, design configurations, spot weld, install a BMS, and wire full protection circuits. Every module builds on the last. By the end, you won't just have a battery — you'll trust the one you built. Your build starts here.