Pump Charger

This would be an extraordinarily small pump.

Would it work and could it be done?

Amp up low voltage and convert it to high voltage. What is possible with 120 ma and 4.20 volts, could you get 300 or higher ma and higher voltage by using lower voltages and current. How hard would it be to build?

Thank you

LPCS

could you get 300 or higher ma and higher voltage by using lower voltages and current.
No, that is not possible for any steady-state condition.
However, you could store some energy in your circuit (in largish capacitors). Then, you could get a high amperage, high current (but brief) pulse as an output.
This is used in camera flash units, flashing light for bicycles, etc.
But if you wanted to run (for example) a tiny motor, at higher current and voltage than the supply can produce, then no, you cannot do that.

I'm sorry, but what you are saying seems to be completely incoherent. I don't know how you could expect to boost both amps and volts, unless an external source is involved.

I also haven't heard of any such thing as a "pump charger" in any relevant context.

so in other words with the info you gave me,,, if 100 ma and 4 volts was a givien then the given current and voltage could be amplified to 14.4v or more but current would be 100 ma or less at 14.4 v correct?

Now could I wire similar systems as the one described to maintain the voltage and bring the ma forward say in a paralel configuration so my current went up too.

I think I asked that correctly.

100 mA x 4 v = 400 mW

400 mW / 14.4 v = 27 ma

So 27 mA would be the best possible output, but in the real world, systems are not 100% efficient, so perhaps 24 mA would be about as good as it gets. If the input is limited to 100 mA, paralleling would not help. (If two systems were used, each would have to work with 50 mA input.)

Unfortunately, there are no free lunches.