I've made a 16 cell battery with Li-ion 18650's salvaged from laptops in a 4s4p configuration at around 16.4V. I'm using it in a Bluetooth speaker I made with a TDA7492 Bluetooth audio board, and am using this 18650 protection circuit. I was wondering if I needed a 16V power supply and connect the charge port straight to the protection board, or if I need something like a TP4056 micro usb, but made for 16V.
I'm still new to all this and am taking every chance I can get to learn more about DC voltage. So any help would be appreciated, thank you.