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In theroy with the correct capacitor you could get higher voltage from the battery if needed.
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Actually capacitors are not capable of stepping up voltage. All cpacitors do is store energy....that's it. You need a transformer to step up voltage.
RI:
For "the drain" on the battery you need to ask this question first:
What are you trying to power and what is it's draw (volts AND amps). Then you can see if there is enough leway on the phone.
I can't tell right now (at work), but if you can run the phone on USB (no battery) then the phone is NOT using more 500mA (that's milliamps). I don't know how many amps the battery is capable of, so I'm no help there. But if you can find that number out you can find out your amperage leway. For volts, unless you want to carry a small transformer around or solder it into your circuit somehow (camera flash transformers are actually very small), you have 3.7v period.
Drew