1x LiPo Battery: https://s.click.aliexpress.com/e/_dZhZsnd

1x TP4056 Board: https://s.click.aliexpress.com/e/_dX8n0hp

1x Arduino Pro Mini: https://s.click.aliexpress.com/e/_d62ALdV

1x INA219 Board: https://s.click.aliexpress.com/e/_dUZvYoX

1x OLED LCD: https://s.click.aliexpress.com/e/_dWfFi0n

1x SD Card PCB: https://s.click.aliexpress.com/e/_dUy68bd

1x Switch: http://amzn.to/2gz9ZtW

eBay:

1x TP4056 Board: http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

1x Arduino Pro Mini: http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

1x INA219 Board: http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

1x OLED LCD: http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

1x SD Card PCB: http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

1x Switch: http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

Amazon.de:

1x LiPo Battery: http://amzn.to/2gM2vXB

1x TP4056 Board: http://amzn.to/2eUvMNO

1x Arduino Pro Mini: http://amzn.to/2g6Ujjr

1x INA219 Board: http://amzn.to/2gM5M9v

1x OLED LCD: http://amzn.to/2g6Q3Rd

1x SD Card PCB: http://amzn.to/2gM9Zdf

Arduino Nano Version

Now that your circuit is complete, it is time to upload the code. You can download it here. But don't forget to download and include the following libraries before uploading:

https://github.com/adafruit/Adafruit_INA219

https://github.com/adafruit/Adafruit_SSD1306

https://github.com/greiman/SdFat