Yes, even if it has a protection circuit, you'll need a charger circuit, which actively controls charging current and voltage, and hopefully monitors temperature to prevent low-temperature charging.
The usual protection circuits just cut off completely with severe overcurrents, and with slight overvoltages, and have no means to actually limit current to safe values, just act like a resetable fuse in case they are greatly exceeded. Also, the protection voltages tend to be a bit over the normal operating values (like 4.25V or 4.30V instead of 4.20V) so that they won't trig at normal, intended operation.