Analog pin is behind multiplexer.

[bhattvishal]

I have just a single analog pin, and I have connected to a multiuplexer to get more analog pins. Is there any way to just pass the value instead of sense pin?

[Mingyu-Kim]

Battery::Battery(uint16_t minVoltage, uint16_t maxVoltage) {
	this->minVoltage = minVoltage;
	this->maxVoltage = maxVoltage;
}

void Battery::begin(mapFn_t mapFunction) {
	this->mapFunction = mapFunction ? mapFunction : &linear;
}

I have added following functions in the cpp/h to create battery class without sense pin
and used uint8_t Battery::level(uint16_t voltage) in mv to get level.

[rlogiacco]

If all you want is to map a sensed voltage to a battery percentage then you don't need to instantiate the Battery class: just use any of the static functions provided:

• sigmoidal(uint16_t voltage, uint16_t minVoltage, uint16_t maxVoltage)
• asigmoidal(uint16_t voltage, uint16_t minVoltage, uint16_t maxVoltage)
• linear(uint16_t voltage, uint16_t minVoltage, uint16_t maxVoltage)

You only have to convert the value you sensed to a voltage and those functions have been declared static also to support this use case. What suggested by @Mingyu-Kim only wastes additional memory to store data that you are not going to use, so the memory is wasted without any benefit whatsoever.