UTS Tower USB Power Bank

This design is based off my Simple USB 5V/2A Power Bank by diyau | Download free STL model | Printables.com but it is modeled to look like the UTS Tower.

This is a snap fit case to build a USB power bank using the required parts (sourced from Aliexpress). An off-the-shelf battery holder is used to make it easy to build. You can easily make your own battery holder if you prefer.
 

The USB board supports 5V/2A Input or Output with LED indicators to show battery remaining.

USB-A port for power out. (eg. charging your phone)

USB-C port for charging (power-in) the power bank.

Parts needed:

USB charging board (weld USB option): https://www.aliexpress.com/item/1005001589184111.html?spm=a2g0o.order_list.order_list_main.15.5ff11802umM3Aq

18650 SMD/SMT Battery Holder: https://www.aliexpress.com/item/32831937650.html?spm=a2g0o.order_list.order_list_main.9.5ff11802umM3Aq

18650 Lithium Ion battery (3.7/3.8V nomiable) of your choosing.

Optional: 14mm x 14mm x 6mm heatsink, should be painted heatsink to avoid short circuit with components on board: 5pcs 14*14*6 Aluminum Cooling Heat sink 14 x 14 x 6MM Black Chipset RAM Heatsink Radiator routing cat dedicated chip 14*14*6mm|Lamp Radiators| - AliExpress

Thermal Paste/Adhesive (to secure the heatsink to the board/case)

22AWG gauge (or wire rated to carry up to 5 amps) insulated wire in red/black colour

Tools needed:

• Soldering iron
• Wire stripper
• Hot glue gun

Print  Instructions:

Layer Height: 0.20mm

Supports: Required on build plate only.

Material: Any (Polymaker Polywood was used for the base/lid to give it that brown colour, and any white filament will work for the “UTS” logo)

Assembly Instructions:

1. Cut 110mm of red 22AWG wire. Remove 5mm of insulation from each end. This will be the positive terminal wire.
   Cut 30mm of black 22AWG wire. Remove 5mm of insulation from each end. This is the negative terminal wire.
2. Before putting the parts into the case, solder the red/black wires from the battery holder to the USB board.
3. Fit the parts (USB board & battery holder joined by soldered cable) into the case, by first slotting in the USB board into the front cut-out. Then push down firmly until the USB board is held in place and the USB ports are oriented correctly. Make sure the battery holder is seated in the case. You can add adhesive or blu-tac to secure it to the case.
4. Insert 18650 battery cell (ENSURE CORRECT POLARITY!)
5. Use hot glue on the sides of the USB board to glue it to the case.
6. Optional: Add thermal paste on top of the board and install the heatsink.
7. Super-glue the “UTS” letters to the case. In my example, I glued it to the lid.
8. Before using the power bank for the first time after battery connection, you need to plug in the charger for at least 10 seconds to activate the USB board.