Build a Custom 4S Li-ion Battery for FPV Drones, RC Planes & More! (Complete Guide)

✈️ Welcome to Stones RC Channel! In this video, we build a 5000mAh 4S Li-ion battery using 21700 Molicel P50B cells — perfect for FPV drones, RC planes, and DIY projects. We’ll walk through the entire process, including: The tools and materials you’ll need Safe spot welding and soldering techniques Proper balance lead wiring and XT60 connector setup Voltage checks and testing Finishing the pack with professional heat shrink wrapping ⚠️ Safety Note: Building lithium batteries can be dangerous if done incorrectly. Follow all safety precautions, work carefully, and double-check your connections with a multimeter. If you enjoy FPV builds, DIY electronics, or battery-making tutorials, don’t forget to like, subscribe, and share for more helpful videos like this! 🔹 My RC Gear: Molicel P50B Cells: https://www.tinkertechau.com.au/produ... Portable Handheld Battery Spot Welder: https://www.aliexpress.com/item/10050... Li-ion Battery Nickel Sheet Plate: https://www.aliexpress.com/item/10050... Lithium Battery Heat Shrink Tube: https://www.aliexpress.com/item/10050... 🔹 Related Videos & Playlists: ▶ LiIon Batteries:    • Li ion batteries   ▶ Soldering Tips:    • Soldering Tips   ▶ Voltage vs Current:    • Voltage and Current   🔹 Follow & Subscribe: ✅ Subscribe for more RC tutorials, reviews & FPV flights:    / @stonesrcchannel   #diybattery #liionbattery #fpvbuild #Molicel #batterypack #21700Cells #inav #rcplanes #fpvdrones #batterysafety #diyprojects #BatteryTutorial #fpvcommunity