I tried to design a charging circuit based on the TP4056 li-po chip. At a usb voltage of 5V, the battery charging output (Pin 5 of TP4056) 4.3V. This seems acceptable, but there seems to be no regulation in my circuit as the battery voltage will vary with the input voltage
VCC-Vbatt 4.50--3.87 4.75--4.12 5.00--4.34 5.25--4.61 5.50--4.82
IBATT connector is shorted for voltage tests.
I do not want to overcharge my batteries with a voltage too high. The TP40456 dosent seem to be doing its job properly.