Answer:
well... chemically not unless you ripped it apart. however, if you want to customize your amperage or voltage, theres no need to go through all that work.
there are systems of wiring called series and parallel. in series wiring, one battery acts as a booster for another adding the two voltages together.
in parallel, the amperage of the individual batteries (which is a measure of the # of flowing electrons) are added together.
for series wiring (add voltages) attach the positive end of one battery to the negative of the other. then hook the non-connected ends of each battery to your circuit. if you had 2 9V batteries, you now have 18 volts. if you had 10 1.5 volt batteries (like AAs) you now have 15 volts. however, this does not increase or decrease the ssystems' amperage. 10 2000mAh batteries in series still have only 2000mAh
for parallel wiring (add amperage) connect the positive lead on your circuit to BOTH POSITIVE ends of the battery. then connect the negative lead of the circuit to both negative terminals on the battery. now instead of having 2 batteries with 2000mAh and double voltage, they act as one battery with 4000mAh, but half the voltage.
examples
2- 1.5 volt 2000mAh batteries
when wired in series- current of 3 volts and 2000mAh
when wired in parallel- current of 1.5 volts and 4000mAh