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Just photos of old power bank design using 100x100 2L boards and many LEDs.

Summary

• 💻 MCU: Cortex-M4 STM32F401
• 🖥 Display: IPS 160×80 px (ST7735)
• ⚡Output voltage (MAX): 150V+
• 🎆 Output current (MAX): 150mA+
• 🔽 Control: Mechanical Buttons
• 🔋 Powering: 1S1P 3.7V 18650 Li-Ion Battery
• 🔊 Notification:  Sound (Buzzer)
• ➡ Charging: USB Type-C

Example of the custom aluminum board with LEDs and USB-C power port and additional optional temperature monitoring sensors (both digital and analog).

How to use your electrical bike battery as power supply system (power bank) to charge you laptop, smartphone and have an LED light ☀? Here is an full assembly manual with chosen parts for build a custom high-power and high-energy power bank.