Quantity   Component name
2 × HX 2S 10a Battery Management System https://www.amazon.com/Anmbest-Charger-Protection-Lithium-Battery/dp/B07KSQY67X
1 × MP1584EN Mini Step down converter (adjustable, 3Amps) https://www.amazon.com/dp/B0B92WYRR4
3 × 0.28 Inch Two-Wire DC LED Digital Voltmeter 2.5V-30V https://www.amazon.com/QCCAN-Two-Wire-Digital-Voltmeter-2-5V-30V/dp/B0BGLH1CQW
2 × 18650 Battery Box for DIY BMS https://www.amazon.de/dp/B07YFDQFWW
4 × 18650 battery 3.7V unprotected
1 × L298N Motor Drive Controller Board Modul Dual H https://www.amazon.de/ARCELI-ST%C3%9CCKE-Controller-Schrittmodul-Arduino/dp/B07MY33PC9
1 × PCA968 16-Channel 12-Bit Servo Motor Driver https://www.amazon.de/dp/B0CC92GWM6
1 × Raspberry Pi Zero 2 W https://www.amazon.de/-/en/Raspberry-Pi-Zero-2-W-multi-coloured/dp/B09KLVX4RT
4 × DC3V-12V DC Gear Motor https://www.amazon.de/-/en/Gebildet-DC3V-12V-4-Wheel-Aircraft-Number/dp/B0B3D789V3