The pen battery you have is fixed voltage. This means that not only can you not change the output voltage, the voltage you do receive from it will degrade as the battery gets used. With your spinner, you will be able to increase the voltage to your coil which will, in turn, make it burn hotter and, thus, provide a warmer vape.
EDIT:
The fact that it's glass instead of plastic makes little or no difference to the temperature of your vape. However, as I noted above, the Evod Glass does come with a dual coil head instead of a single-coil. This means that you will have two coils heating your liquid, also potentially giving you a warmer vape.