So I found this part: SparkFun LiPo Charger/Booster - 5V/1A - PRT-14411 - SparkFun Electronics
I want to use it to power the wearable computer, but I'm running into many documentation problems.
For one, the part says that it has no undervoltage protection, which is rather annoying. However, my batteries have this feature built-in (like most LiPos), though I have no idea what the cutoff voltage is. I need this measurement so I can accurately calibrate the voltage sensors so the cutoff voltage displays 0%, and the full charge voltage displays 100%.
The second problem is the switch on board. It says the maximum rated current is 600mA, but the load on the wearable varies depending on what the main computer (Pi 0 W) is doing. There's not much concrete information on what the Pi can reach in terms of power consumption, so it's hard to tell if an external switch is required. Should I just build a prototype and measure the current draw? Change the switch based on that?
Another issue is the ENABLE pin. What does it do? How is it any different from just flipping the switch off?
If anyone has answers to anything here, it would be much appreciated.