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How to make your own power bank with 3-D printing

How to make a power bank with a 3-D printer, power board controller, and a lithium ion or lithium polymer battery.

Principles:

• Any lithium rechargeable cells can be used singly or in parallel to create a 3.6 (3.7) Volt pack. The cells do not have to be the same capacity. Even cells salvaged from a laptop batteries can sometimes be used.
• The charging voltage is 5V, supplied through a standard micro-USB jack
• The output is 5V 2.5A through either or both standard USB charging ports
• Fuel Gauge LEDs are supplied with the power bank controllers
• The cases snap together
• The LEDs are blue, but they will cause red, green, or yellow buttons to fluoresce in their own colors as shown
• Buy the power bank controller boards here
• If you modify these designs we would love to share them here

Type 1 photos	Type 2 photos
		With 18650 Cells. You can use 1 or 2 cells with Type 1, or 1, 2, or 3 cells with Type 2
		With polymer cells
3-D printer files download for Type 1 power bank	3-D printer files download for Type 2 power bank