Charging Li Batteries in the Car

I wanted a solution for charging Li-chemistry batteries (LiFePO4 mostly) in the car. Commercial chargers are pricy! This solution uses inexpensive boards from Amazon to deal with the random voltages in a car and the charging characteristics of a lithium battery. If you want to 3D print a case, here's a nifty viewer submitted design (Thanks Charlieray!!!). https://www.thingiverse.com/thing:509... Chapter markers are provided so you can skip the gabbing if you like. Remember it's easy for you to skip/fast-forward. There's no "tell me more" button for folks who want the long format.... The boards I used: Charge controller: https://www.amazon.com/gp/product/B06... DC to DC converter: https://www.amazon.com/gp/product/B08... 00:00 - Intro 00:31 - Voltage Considerations 01:46 - Current Considerations 02:55 - CC-CV Charging 03:27 - BMS Boards 04:45 - Circuits we can buy 05:55 - Charging circuit on the bench 11:46 - DC to DC Boost board on the bench 21:11 - Wrap Up